Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8b1bcedade8541…

MALICIOUS

PDF

76.2 KB Created: 2021-06-11 06:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 133b20ae3ce844c9a4e0a2f2b022ad2d SHA-1: 68b966c74a88ce2f53c2d708a90b10e797be6b27 SHA-256: 6e8b1bcedade85410c98a542f3fb2cac4561f1ee3e7ee8a7947450532abc2ecb
194 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, appears to be a lure for game downloads, aligning with phishing or malware distribution tactics. The presence of numerous external URIs and the PDF_SEO_LINK_FARM heuristic strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/pbw?utm_term=gta+sa+underground+highly+compressed+for+pc PDF link annotation
    • https://finenomasawovep.weebly.com/uploads/1/3/1/4/131437785/7856898.pdfIn PDF document text
    • https://lejufonibo.weebly.com/uploads/1/3/4/4/134470114/1714062.pdfIn PDF document text
    • https://jagusidenoz.weebly.com/uploads/1/3/4/9/134902343/4860102.pdfIn PDF document text
    • https://visuripaxu.weebly.com/uploads/1/3/4/7/134711721/da1b57441c6334a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408333/normal_60bb042f97e4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374380/normal_6002bbd31e4fe.pdfIn PDF document text
    • https://pibowalemarume.weebly.com/uploads/1/3/1/1/131164440/7e072abee5a2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367923/normal_5fdef0c043892.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tusawijer.pbworks.com/f/r_rajkumar_movie_download_filmywap.pdfIn PDF document text
    • http://wotasaful.pbworks.com/w/file/fetch/144881457/fotografia_digital.pdfIn PDF document text
    • http://wovonixir.pbworks.com/w/file/fetch/144695415/21029236543.pdfIn PDF document text
    • http://zidedabi.pbworks.com/w/file/fetch/144977133/bts_wallpaper_pictures.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144428007/concept_of_human_resource_planning.pdfIn PDF document text
    • http://mamejoniza.pbworks.com/f/6934175835.pdfIn PDF document text
    • http://xodelow.pbworks.com/w/file/fetch/144590223/negideva.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 5704 bytes
SHA-256: d95b9329b68c746fd2a9504fff967116ffd5a2152f6bacc7a1d96fa925ac029c
font_01_sfnt_off0000f438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF438 13984 bytes
SHA-256: 1b74aa4e78584355bf70a16d924766eb5a0a69ba84d3c1e08967b89d39a90094

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