The ICC has long been hinting that any match which ends in an unpredictable surprise ending is a fixed one. If a better team is beaten by a lesser team or if wickets collapse in a heap, it is attributed to match fixing. Cricket is a game of surprises and tight finishes. If the ICC expects that all teams should play according to their ratings, then Australia would beat Pakistan 10 times out of 10. Surely, it would be ridiculous to assume such a domination. Then, if any surprise occurs, the ICC will call it match fixing. The germ of match fixing exists only in the mind.
Any game which is played under a given set of rules will provide results which will not always be expected. Kenya beat West Indies in the 1999 World Cup, Bangladesh took India into the 5th day in their first test match, New Zealand beat defending champs, hosts & favourites Australia in the first match of the 1992 World Cup. Many instances may be recollected in which an upset victory or a sudden collapse was recorded. If the ICC keeps a suspicious attitude, then they would find every second match fixed.
The bottom line is that fixed matches happen more in thought than it does on the sacred cricket field.