There are adjustments that can be made without removing the drum, but it may be worth pulling it anyway.
This is a view of all the components. They must all be here for the brake system to work correctly. If all is there, it still may be worth it to grease the moving components.
If you�re confident that all parts are here, and don�t think they need some lube, you can turn the drum so the holes are over the two star shaped nuts over on the left of this photo. See the two blue arrows.

With a screw driver, you can spin these stars outward to bring the pads closer the face of the drum. If you can�t get them to move, you will want to pull the drum, then go ahead and lube stuff up�including these star adjusters.
Tim