alvarnell's post in Silver Sparrow detected by Malwarebytes was marked as the answer
The purpose of this forum is so users can submit suspected malware files for analysis by Malware Hunters and the Malwarebytes Lab staff.
There is a lengthy discussion of Silver Sparrow in the Mac Malware Removal & Support forum at
alvarnell's post in Malware Blocked While Browsing was marked as the answer
Not unless you actually downloaded something from that/those sites previously. Even then it doesn't necessarily mean that everything downloaded from that/those sites is malware. Run the Malwarebytes app to determine if you have any.