Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bccb5b3c04a90dd…

MALICIOUS

PDF

79.7 KB Created: 2021-04-27 09:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a99955e739b76a7b4f55eef34ea214a SHA-1: e2876b8fefcdb3cda27bcee604f8937f2ad22079 SHA-256: 1bccb5b3c04a90ddd5d00b7757c244c8a79769bee23c81d1ecfe7de6158e0a29
64 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on seemingly legitimate domains but point to suspicious PDF files. The ML classifier flagged the PDF as malicious, and the presence of a link farm heuristic suggests an attempt to obscure the true destination. The document body, though heavily obfuscated, contains references to 'Tom Clancy's Rainbow Six Quarantine' and 'wkhtmltopdf', likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7748

Heuristics 3

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 https://europa-ts.ru/sites/default/files/webform/6529842099.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/65000750087.pdf
    • https://ambrose.edu/sites/default/files/webform/93854264345.pdf
    • https://www.mainephilanthropy.org/sites/default/files/lipedoketuparukol.pdf
    • https://architecturaldesigninc.com/sites/default/files/56675633315.pdf
    • http://www.birdlifebotswana.org.bw/sites/default/files/webform/sightings-sketches/beporu.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/75468476758.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/86929885116.pdf
    • http://portal-mysigma.com/system/files/student-proof/wofofokarawivuboniju.pdf
    • https://www.pharoxglobal.com/sites/default/files/webform/50635107556.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/zomosazufexebale.pdf
    • https://natsihwa.org.au/sites/default/files/webform/17015803.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=tom+clancy%2527s+rainbow+six+quarantine+date+de+sortie
    • https://campusrec.princeton.edu/system/files/webform/popikinof.pdf
    • https://community.princeton.edu/system/files/webform/42655509772.pdf
    • https://lib.asu.edu/system/files/webform/liwubuwivak.pdf
    • https://umatter.princeton.edu/system/files/webform/requests/72435273025.pdf
    • https://lib.asu.edu/system/files/webform/simadovi.pdf

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