Just add belove text to file /etc/httpd/conf/extra/httpd-includes.conf :
### BAD BOTS BLOCK SetEnvIfNoCase User-Agent "AhrefsBot" bad_bots SetEnvIfNoCase User-Agent "Dotbot" bad_bots SetEnvIfNoCase User-Agent "MJ12bot" bad_bots SetEnvIfNoCase User-Agent "SemrushBot" bad_bots #SetEnvIfNoCase User-Agent "Yandex" bad_bots #SetEnvIfNoCase User-Agent "YandexBot" bad_bots <Location /> Order Allow,Deny Deny from env=bad_bots Allow from all </Location> ###