Malicious PDF — malware analysis report

Static analysis result for SHA-256 545d3bbb1b05fbf7…

MALICIOUS

PDF

54.7 KB Created: 2021-04-10 00:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 605a7caa05eb9c9d2d33a3f84f91f34e SHA-1: 66171acf82d406051fb520f08e3cb55a467e2d20 SHA-256: 545d3bbb1b05fbf7e963e1b4dc502b02257521daa87067338a3187f7a09f12c5
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or directing users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6699

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ambrose.edu/sites/default/files/webform/54125375098.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/17184396690.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/povufukawonafano.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/604022749.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/22435641867.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/dakorudi.pdf
    • https://web.liderpapel.com/sites/default/files/webform/dojoxopanikofogenag.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/welukugipevodabarovefeweb.pdf
    • http://www.birdlifebotswana.org.bw/sites/default/files/webform/sightings-sketches/12812059159.pdf
    • http://portal-mysigma.com/system/files/student-proof/woximinel.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=alberto+rivera+comics+free+pdf
    • https://lib.asu.edu/system/files/webform/61431168480.pdf
    • https://printandmail.princeton.edu/system/files/webform/31356988355.pdf
    • https://printandmail.princeton.edu/system/files/webform/zupedofijemurak.pdf

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