Malicious PDF — malware analysis report

Static analysis result for SHA-256 3559428afbe8a5b9…

MALICIOUS

PDF

11.9 KB Created: 2015-07-15 14:35:59 +04:00 Authoring application: DOMPDF
MD5: 23f2936e543b74adc9caa14679cd3b78 SHA-1: 879a97473f0afa5afbda4835afbbb807c493a8a2 SHA-256: 3559428afbe8a5b9438af1234fe668b100e48317b10f1048ebdb6ea35a15eece
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, forming a link farm designed to direct users to various websites. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves luring users to these external sites, likely for further exploitation or phishing. No scripts were extracted, and the document body was heavily obfuscated, limiting deeper analysis of the immediate payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8959

Heuristics 2

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://photo-file.ru/index.php?article=839.1&wehsa=1&pdf=839
    • http://modart.com.tr/index.php?article=1598.1&ykgew=1&pdf=1598
    • http://msobo.fr/index.php?article=1763.2&dfkro=2&pdf=1763
    • http://photo-file.ru/index.php?article=1228.1&wehsa=1&pdf=1228
    • http://information32.org/index.php?article=848.1&ugibr=1&pdf=848
    • http://photo-file.ru/index.php?article=1839.1&wehsa=1&pdf=1839
    • http://marcogulf.com/index.php?article=1678.1&puzto=1&pdf=1678
    • http://cierzodemontana.com/index.php?article=162.7&vfjgt=7&pdf=162
    • http://www.mantrabeautybar.ca/index.php?article=1846.1&rukbv=1&pdf=1846
    • http://photo-file.ru/index.php?article=768.1&wehsa=1&pdf=768
    • http://photo-file.ru/index.php?article=2475.1&wehsa=1&pdf=2475
    • http://photo-file.ru/index.php?article=1834.1&wehsa=1&pdf=1834
    • http://archerwealth.com.au/index.php?article=758.1&ldzws=1&pdf=758
    • http://photo-file.ru/index.php?article=2082.1&wehsa=1&pdf=2082
    • http://vioval.eu/index.php?article=366.1&irrir=1&pdf=366
    • http://photo-file.ru/index.php?article=1641.1&wehsa=1&pdf=1641
    • http://madejalook.com/index.php?article=1619.1&ynlkg=1&pdf=1619

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