Frequency? Mode of operation you recorded this in? There does not appear to be any usable data in this recording, just something breaking squelch.
At first glance this looks like 6 pulses, each 100 msec long, in groups of 2, with 20 msec between the pair and a pair every 900 msec. But since the pulse is not actually represented, only the breaking squelch / change of AGC is shown, it is hard to be sure.
Try another recording, don't have the squelch on, use USB mode, and tune 1 kHz low. This will increase the probability that something can be made of the recording.
HFDF stations do not link via HF, at least none I have ever heard of or worked at.
T!