Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbbe3b17ea05b939…

MALICIOUS

PDF

70.3 KB Created: 2021-04-13 23:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5189141e4e545bfc9bc1165f87933a2 SHA-1: 343ddfefa74790cdb230131a3a7de85137ba8b39 SHA-256: bbbe3b17ea05b939cc6aec70566f10966c6bbbdf20989525e3f15fb32858773c
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML_NYX_PDF_MALICIOUS and ClamAV detections strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8913

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://www.osgeurope.com/sites/osg-corporate.dev/files/webform/gurasijam.pdf
    • http://seiary.com/sites/default/files/webform/rec/11252708720.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/65810703597.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/wogudodijanaferewinige.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/xugapovapoz.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/ligexupasofobepis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=powerpoint+presentation+keyboard+shortcuts
    • https://printandmail.princeton.edu/system/files/webform/68272747422.pdf
    • https://thesanfordschool.asu.edu/sites/default/files/webform/xumigisapiwonatidokababup.pdf
    • https://lib.asu.edu/system/files/webform/rutepirunumobapof.pdf
    • https://www.ice.cam.ac.uk/sites/www.ice.cam.ac.uk/files/webform/tivajojisepizoni.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebdd.bin
7e55fd993f4ba61c0f76e8cef7e6ec5be9438bd13eb4b8345233fab480ba109c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDD 5528 bytes

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