Malicious PDF — malware analysis report

Static analysis result for SHA-256 286317804bc4fe24…

MALICIOUS

PDF

88.4 KB Created: 2021-04-10 18:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26fd50a2fd2ed692dc8b85fb368da2b6 SHA-1: ccdd90d63d191d17ca90d130d1e4fcb6e172a5d3 SHA-256: 286317804bc4fe24c9a9f4d88f1e19348cfcec3442609b94b77f88fa89ef8ad7
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external URIs. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content. The presence of many unknown reputation URLs indicates a high likelihood of these being used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://www.termis.org/system/files/webform/nibobuzokojovafizuza.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/wajuso.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/mikax.pdf
    • http://www.birdlifebotswana.org.bw/sites/default/files/webform/sightings-sketches/lewuxevibonotokezesa.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/70037852461.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/99284441703.pdf
    • https://www.termis.org/system/files/webform/776381217.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/sojinikud.pdf
    • https://web.liderpapel.com/sites/default/files/webform/21411595718.pdf
    • https://www.afscme65.org/system/files/webform/52844377902.pdf
    • https://europa-ts.ru/sites/default/files/webform/6529842099.pdf
    • https://www.a1touchsolution.nl/sites/default/files/rowiduw.pdf
    • http://russian-ice-spb.ru/sites/default/files/webform/files/zatepatepekaberemosigedix.pdf
    • https://ambrose.edu/sites/default/files/webform/59680287402.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=girls+frontline+core+farming
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001111d.bin
98b46bb289461daf7107f1b88383510f0ed93a7b9336a9cd8e2d19a1701e9d0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1111D 5020 bytes
font_01_sfnt_off00012217.bin
8294574ee8b4ba3e2f6e831556da8cc9a2a54b61c63ff56ffd2e4cd431e3376f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12217 10636 bytes
font_02_sfnt_off0001465c.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1465C 4324 bytes

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