Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa84f60b95fd708e…

MALICIOUS

PDF

118.8 KB Created: 2021-04-07 04:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a1b84360e3dc3a04f9ee82ba8b4cfe1 SHA-1: 0574f90b66830bad0af67eb016cd295be2b82b87 SHA-256: aa84f60b95fd708e10f7201eb50e19342925be5813af14bf2988d055840e174a
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution. The presence of multiple unknown URLs further supports this, indicating a potential phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 http://cicatsalud.com/html/sites/default/files/webform/foxegedukob.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/sowasipaxezok.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/13471650610.pdf
    • https://www.uts.cw/sites/default/files/webform/xewaz.pdf
    • https://www.a1touchsolution.nl/sites/default/files/tarutemivejumariwara.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/10654010608.pdf
    • https://www.woonsocketri.org/system/temporary/webform/bogobovimefegaf.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/34782296767.pdf
    • https://aboss.by/sites/default/files/webform/89266631471.pdf
    • http://portal-mysigma.com/system/files/student-proof/72808970040.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/tajiwugebewozebukak.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/jowodudarazobipadumalo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=menorrhagia+treatment+guidelines+pdf
    • https://www.healthdata.org/sites/default/files/resumes/53082175038.pdf
    • https://gradfutures.princeton.edu/system/files/webform/buviboxakutovovujigobimis.pdf
    • https://community.princeton.edu/system/files/webform/22535495660.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001921c.bin
8f63f1cc6d0c1cd7251a67d2a47890e9fe0b84b1f85d9ead1f9bf790364a2731		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1921C 5460 bytes
font_01_sfnt_off0001a48f.bin
b525fd49a757e4042f3d775faa877524939386ff703cb05ba6f885ad3971a1f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A48F 11968 bytes

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