How can I get rid of the "Safari virus" on a Mac?

Periodic popups show up from Safari (I think) with a variety of quickly-disappearing warning messages that take me to bad sites. I'm running Bitdefender Antivirus for Mac on a MacBook Pro, and it shows Web Protection for Safari in the dashboard, with Traffic Light installed for Safari. I don't have any Safari extensions except Bitdefender.

Thanks!

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