Clamav mailing lists..
This, put it in your bag of last option solutions..
http://lists.clamav.net/pipermail/clamav-users/2017-August/005014.htmlAdded :
For those of us living on the underside of the planet freshclam.conf has
DatabaseMirror db.local.clamav.net
DatabaseMirror database.clamav.net
Both resolve to only one ip 193.1.193.64 and that is being problematic, so whatever you do even using the wikis refreshclam it always resolves, for those in OZ, maybe NZ as well, to that ip, and as its up and down, so you get the update failures that are still happening down here. Works for a while then borks again.
So I have done as suggested in the clamav ML, link above, and now pull from a german mirror
When the Oz mirror settles down and behaves I will reset the freshclam.conf back to its default settings