Is the link below from fbsbx. com known as a phishing link?

There are several techniques to check whether the domain lookaside fbsbx.com is owned by Facebook.

WHOIS record

• Let's check the WHOIS record for fbsbx.com:
  
• Registry Registrant ID:
  
• Registrant Name Domain Administrator
  
• Registrant Organization Facebook, Inc.
  
• Registrant Street 1601 Willow Road,
  
• Registrant City Menlo Park
  
• Registrant State/Province CA
  
• Registrant Postal Code 94025
  
• Registrant Country US
  
• Registrant Phone +1.6505434800
  
• Registrant Phone Ext:
  
• Registrant Fax +1.6505434800
  
• Registrant Fax Ext:
  
• Registrant Email domain@fb.com
  
• fb.com is one of Facebook's domains, and the registrant organization is Facebook, so that looks legit.
  
• DNS record
  
• dig NS fbsbx.com
  
• ;ANSWER
  
• fbsbx.com. 52794 IN NS a.ns.facebook.com.
  
• fbsbx.com. 52794 IN NS b.ns.facebook.com.
  
• The nameservers are on the facebook.com domain, which also looks legit.
  

TLS certificates

https://lookaside.fbsbx.com/ delivers a certificate issued for the following domains:

• *.facebook.com
  
• *.facebook.net
  
• *.fb.com
  
• *.fbcdn.net
  
• *.fbsbx.com
  
• *.m.facebook.com
  
• *.messenger.com
  
• *.xx.fbcdn.net
  
• *.xy.fbcdn.net
  
• *.xz.fbcdn.net
  
• facebook.com
  
• fb.com
  

messenger.com So whoever owns fbsbx.com also has access to a valid facebook.com certificate.

The domain is legit. Be warned that the PDF linked in the post may still link to phishing sites.