Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ca2d7a283e5b94…

MALICIOUS

PDF

11.5 KB Created: 2015-07-15 14:38:49 +04:00 Authoring application: DOMPDF
MD5: 56ef28b899d51aec9eec1bf9bab6b800 SHA-1: 85756dc7c4af3040d74a58c552aa17dba1ab6b3e SHA-256: 79ca2d7a283e5b94a77ee408a52356cd803a719575f400c47e873aa7559e7519
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various external websites. The ML_NYX_PDF_MALICIOUS classifier also flagged the document. While no scripts were extracted, the sheer volume and nature of the links suggest a malicious intent, possibly for SEO poisoning or to redirect users to malicious content. The document body itself is heavily obfuscated and contains some of these URLs.

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=1976.1&wehsa=1&pdf=1976
    • http://amicosmeceutici.it/index.php?article=847.1&replv=1&pdf=847
    • http://pathica.net/index.php?article=177.1&ikbca=1&pdf=177
    • http://photo-file.ru/index.php?article=1254.1&wehsa=1&pdf=1254
    • http://razan.com.ua/index.php?article=1801.1&vafyr=1&pdf=1801
    • http://photo-file.ru/index.php?article=335.1&wehsa=1&pdf=335
    • http://www.myrlimo.com/index.php?article=855.1&sqfkb=1&pdf=855
    • http://www.mantrabeautybar.ca/index.php?article=124.1&rukbv=1&pdf=124
    • http://les-zephyrs.com/index.php?article=1809.2&ylevy=2&pdf=1809
    • http://photo-file.ru/index.php?article=1321.1&wehsa=1&pdf=1321
    • http://photo-file.ru/index.php?article=1103.1&wehsa=1&pdf=1103
    • http://photo-file.ru/index.php?article=665.1&wehsa=1&pdf=665
    • http://camus-sarl.fr/index.php?article=2399.2&fnxpz=2&pdf=2399
    • http://photo-file.ru/index.php?article=1608.1&wehsa=1&pdf=1608
    • http://barrainformativa.com/index.php?article=249.2&eyxlg=2&pdf=249
    • http://photo-file.ru/index.php?article=1312.1&wehsa=1&pdf=1312
    • http://shoppinga.it/index.php?article=667.1&nznbl=1&pdf=667

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