I am interested in buying https://myroadeo.com/hercules-mtb-geared-bikes/27-5-29er/hannibal-27-5/ model which has dual suspension. Can a rider weighing 105 Kg, use this bicycle?
Most department store, BSO (Bicycle Shaped Objects), and entry level bikes carry an advertised weight limit of 250lbs (113kg), which is also I imagine on the safe side, or what some would call a lawyer number. So you should be fine if you decide that is the route you want to go.
A steel framed cheap full suspension will be very heavy, and I would recommend starting with front suspension only, and an alloy model of bike if possible to save some weight – that same company offers several. Then if you ride the bike for a few years and really get into it, save up and spend a little more on a decent full suspension if you want. I ride full suspension and don't necessarily "need it" but I enjoy it more and I do a lot of trail riding with technical features. A higher end full suspension will have different levels of lock out which is a big plus when riding pavement or anything other than trails and off-road.