Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd784abc07e8fb9…

MALICIOUS

PDF

92.7 KB Created: 2021-05-24 16:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4829dc6334c6a2dc24b569e3be4648b SHA-1: 5bf0245f7fe10e9450be24ba7400f3ec97ea41e9 SHA-256: 8bd784abc07e8fb9e070fff45cc2b47d8690cc4fdf866c1c82d45af6b8f6fb7e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=549+powerful+coaching+questions
    • https://zuberexuwaxif.weebly.com/uploads/1/3/4/5/134501439/1679288.pdf
    • https://bodovusinorone.weebly.com/uploads/1/3/5/3/135347185/e90530a9537.pdf
    • https://vinofuloro.weebly.com/uploads/1/3/4/8/134850824/dabalifepanudi.pdf
    • https://jidukuroji.weebly.com/uploads/1/3/4/0/134013204/8d9e27.pdf
    • https://vewevemeza.weebly.com/uploads/1/3/2/7/132741136/narudaki-mebifagomojav-ruxireg.pdf
    • https://momewevegugeb.weebly.com/uploads/1/3/5/3/135326076/4540828bf6.pdf
    • https://sowozulame.weebly.com/uploads/1/3/4/7/134733070/33285fb8104c9.pdf
    • https://static.s123-cdn-static.com/uploads/4421780/normal_5fdf9e6ce87d0.pdf
    • https://pafajarofotixo.weebly.com/uploads/1/3/4/7/134773208/zunujunox_xekumanukojik.pdf
    • https://lopufofogepuxal.weebly.com/uploads/1/3/4/6/134695200/a7f080c02b0.pdf
    • https://sidutoxa.weebly.com/uploads/1/3/4/8/134886075/28490bc2506.pdf
    • https://cdn-cms.f-static.net/uploads/4416791/normal_6025756214dbf.pdf
    • https://static.s123-cdn-static.com/uploads/4382413/normal_5fedece55d539.pdf
    • https://rifivubego.weebly.com/uploads/1/3/1/4/131407021/1f845d93661.pdf
    • https://lomagifotoji.weebly.com/uploads/1/3/0/8/130814873/b121300141.pdf
    • https://titobabedax.weebly.com/uploads/1/3/4/3/134317276/duvubadawamupudevok.pdf
    • https://lededafekipolo.weebly.com/uploads/1/3/4/4/134404801/xubalilokatiwikubaw.pdf
    • https://pigunakates.weebly.com/uploads/1/3/4/6/134628742/malodilumi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00012c81.bin
7e758c72a18c0ebd4c22fb2de16fe56fa162dc05406e3e3926f28d8b8a9a8532		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C81 5768 bytes
font_01_sfnt_off00014037.bin
2665b7df8063faf1aa9f68960b3e9b42f018f68600ab5705a9e03494b3e396d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14037 11132 bytes

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