Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ad1af0757933fe…

MALICIOUS

PDF

27.4 KB Created: 2020-04-15 21:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: db0130e8240550ae73800f30720f2ce7 SHA-1: b31e4b14d56ebb4a4dcd1ea0a85d31f5543bf18b SHA-256: 03ad1af0757933fe77040a48a280be01654418bcb927ea108011fd7625dd1feb
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm or SEO spam campaign. The document body, though heavily obfuscated, contains references to URLs that are also present in the extracted URL list. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 3

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://kathrin-walther.com/uploads/1/3/1/3/131379536/131379536.html#conditional+sentences+1+2+3+worksheets
    • http://desiplatforms.com/uploads/1/3/0/5/130589413/mokagi.pdf
    • http://neilbricco.com/uploads/1/3/1/4/131438241/zavuweguwafapem_gudevupegulavi_sikimufotomebis.pdf
    • http://brainfreezefilms.com/uploads/1/3/0/2/130271177/dd774b05.pdf
    • http://jorgebrilhante.com/uploads/1/3/1/4/131438510/81e513ca5903.pdf
    • http://cbdirect.store/uploads/1/3/0/6/130603715/d4c7e20.pdf
    • http://parkerskinderparadise.com/uploads/1/3/0/8/130814596/wiremujirilevado.pdf
    • http://browngreasefuel.com/uploads/1/3/0/3/130323697/kamotejizimur.pdf
    • http://tillyslandscapingspr.com/uploads/1/3/0/6/130621165/8765435.pdf
    • http://coyshoneyfarm.com/uploads/1/3/1/3/131383949/ropukarizuguma_femep_lesojuz.pdf
    • http://cascara-coa.com/uploads/1/3/0/5/130550785/fc960f41.pdf

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