The knot used for this paracord lanyard/fob is a two strand lanyard knot, called the 'Chinese Crown Knot'. This is knot #808 in the ABoK(Ashley Book of Knots). The knot is also known as the Chinese cross, or the Rustler's or Friendship knot. Another knot book has it named as the Japanese Crown Knot or Japanese Success Knot.
I tied a series of eight of them with a three foot long length of paracord(inner strands intact), adding a little west country whipping on the end with some 0.9mm cord.
The knife shown is a Spyderco Salt I. In a couple of the photos, there's a ball bearing used to prop the knife up in back of the Spydie hole, just sayin' cause I know someone will ask. A carabiner or S-Biner could be used as an attachment, if clipped between the last couple of knots.