Malicious PDF — malware analysis report

Static analysis result for SHA-256 999212eaa7f4e606…

MALICIOUS

PDF

62.7 KB Created: 2021-04-09 22:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f42692af8f8b5b786e2524cf0ccdf99 SHA-1: 22eabcca1297d85cd5cbdea2144e48ebff7e5cd4 SHA-256: 999212eaa7f4e606f19b2545a57d8cea2c0e420519a9f3e042c1e869b0e1e8a8
124 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are unknown or flagged as potentially malicious. The PDF structure and embedded content suggest an attempt to lure users to external resources, consistent with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8119

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/42416127327.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/lerudaxalopavowurugepoviw.pdf
    • https://ambrose.edu/sites/default/files/webform/11364316539.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/tajiwugebewozebukak.pdf
    • https://aboss.by/sites/default/files/webform/76513539396.pdf
    • https://ambrose.edu/sites/default/files/webform/talizovub.pdf
    • https://web.liderpapel.com/sites/default/files/webform/xikamiwaboloz.pdf
    • https://www.dgs-interparts.be/sites/default/files/7838369457.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/71502920023.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/zavemazawutojene.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=sacred+geometry+architecture+books
    • https://printandmail.princeton.edu/system/files/webform/ziwilijevugibapuvoboka.pdf
    • https://gradfutures.princeton.edu/system/files/webform/48950823745.pdf
    • https://thesanfordschool.asu.edu/sites/default/files/webform/83703622856.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d56d.bin
d07d9a1a4d2fe905e6108498768be7ebe4dbeab99afeea15aca205edb84871cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD56D 5728 bytes

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