run as root
wget -O /var/lib/clamav/djsing.ndb https://raw.githubusercontent.com/Djalin/clamav.bases/master/djsigs.ndb
command for cron
00 03 * * * sudo /usr/bin/wget -O /var/lib/clamav/djsing.ndb https://raw.githubusercontent.com/Djalin/clamav.bases/master/djsigs.ndb