Malicious PDF — malware analysis report

Static analysis result for SHA-256 726692d938cb95a2…

MALICIOUS

PDF

63.6 KB Created: 2021-04-23 08:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5c2a9d3ed6ae2f36bfde76145d69a33 SHA-1: b9cd16ee7227812097748bf2f52646d8b66e4c7d SHA-256: 726692d938cb95a2c5f9a57913981b4117fa79c04d732fdd90db09af4c1aab81
64 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with heuristics indicating it functions as a link farm on disposable hosting. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of external URIs and the link farm behavior suggest an attempt to redirect users to potentially malicious content, possibly for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8608

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://www.jsif.org/sites/default/files/webform/meratasadif.pdf
    • https://aboss.by/sites/default/files/webform/76513539396.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/17423244846.pdf
    • https://www.jwico.com/sites/default/files/webform/23528315583.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/tuwagamutavuvefofufeniz.pdf
    • https://ambrose.edu/sites/default/files/webform/28961662769.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/sidetarebuw.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/37570077738.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/nutuzisujobipusife.pdf
    • https://www.dgs-interparts.be/sites/default/files/42042694998.pdf
    • https://www.jsif.org/sites/default/files/webform/95147346690.pdf
    • https://www.dgs-interparts.be/sites/default/files/viwiredozilopuvotudulufez.pdf
    • https://www.telluridescience.org/sites/default/files/tstc-applications/30232074114.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=minolta+mn35z+battery+charger
    • https://gradfutures.princeton.edu/system/files/webform/ninavixokamorul.pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/janoruzafasolefixos.pdf
    • https://campusrec.princeton.edu/system/files/webform/34970544405.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d608.bin
81b024c5dc3b85b6e0271b28565a867cf138f7cd30ea1e6644ff1d46a5320b4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD608 5620 bytes

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