Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d2d5a88b066a68…

MALICIOUS

PDF

11.9 KB Created: 2015-07-16 22:11:06 +04:00 Authoring application: DOMPDF
MD5: 915939fa0c27209d2761d932bb3b7d87 SHA-1: c2a5f8b6277b2900c18e069ae5d3e8f80cf20126 SHA-256: 25d2d5a88b066a6849d191353e4ce6d420ce3d1961da890989ab9465033768b8
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded URLs pointing to SEO-optimized websites, indicating a link farm or redirection scheme. The ML classifier also flagged the PDF as malicious. The document body contains garbled text but includes several of the same URLs, suggesting the primary purpose is to drive traffic to these external sites, likely for further malicious activity.

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=1815.2&tpnxb=2&pdf=1815
    • http://wbus.nl/index.php?article=2435.7&exicf=7&pdf=2435
    • http://hsaig.com/index.php?article=961.2&ejhpr=2&pdf=961
    • http://photo-file.ru/index.php?article=538.2&tpnxb=2&pdf=538
    • http://www.servicerite.com/index.php?article=933.3&ouaye=3&pdf=933
    • http://photo-file.ru/index.php?article=213.2&tpnxb=2&pdf=213
    • http://www.myrlimo.com/index.php?article=2073.1&sqfkb=1&pdf=2073
    • http://krummenacher-haustechnik.ch/index.php?article=1178.1&ptfan=1&pdf=1178
    • http://www.mantrabeautybar.ca/index.php?article=1219.2&chffj=2&pdf=1219
    • http://photo-file.ru/index.php?article=934.2&tpnxb=2&pdf=934
    • http://photo-file.ru/index.php?article=1574.2&tpnxb=2&pdf=1574
    • http://photo-file.ru/index.php?article=821.2&tpnxb=2&pdf=821
    • http://ura-sandoz.com/index.php?article=529.2&beoet=2&pdf=529
    • http://photo-file.ru/index.php?article=723.2&tpnxb=2&pdf=723
    • http://asinvestmentgroup.com/index.php?article=438.1&jckgl=1&pdf=438
    • http://photo-file.ru/index.php?article=447.2&tpnxb=2&pdf=447
    • http://vioval.eu/index.php?article=43.1&irrir=1&pdf=43

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