Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c168267a355cd24…

MALICIOUS

PDF

75.7 KB Created: 2021-02-19 08:16:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 4ec1d6a79c98a67732e0ad54bb6eef74 SHA-1: bcccd591e3d5633e4fd23db51ad63f2b2f0d28d8 SHA-256: 9c168267a355cd24b4fb6d83296092eb8cc7d8738c3d2115a99a85e271806f8e
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a URL that appears to be a lure for downloading a game, but is flagged as malicious. The PDF also exhibits characteristics of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=marvel+vs+capcom+3+download+for+pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461216/normal_6028a2d3594a7.pdfIn PDF document text
    • http://weduwili.iblogger.org/57210508577.pdfIn PDF document text
    • http://kojurebajalafaw.22web.org/bepoxebolimabani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488315/normal_6012564bb24db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuvujibirili.epizy.com/fatewokir.pdfIn PDF document text
    • http://runodeb.rf.gd/rojexarulipalapudi.pdfIn PDF document text
    • http://nirobow.epizy.com/bestie_photo_app.pdfIn PDF document text
    • http://vejimugar.epizy.com/attach_file_in_mail_in_c.pdfIn PDF document text
    • http://zufomukibataj.rf.gd/84033127673.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/bootstrap_cdn_or.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/43222436856.pdfIn PDF document text
    • http://feramivo.rf.gd/newsletter_microsoft_word_templates_free.pdfIn PDF document text
    • http://kemeterotef.rf.gd/97679686299.pdfIn PDF document text
    • http://matufuw.rf.gd/little_nightmares_apk_rexdl.pdfIn PDF document text
    • http://werewipabelud.rf.gd/college_acceptance_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/ryobi_scroll_saw_sc164vs_manual.pdfIn PDF document text
    • http://vibupozikijebi.rf.gd/ce_declaration_of_conformity_sample.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE2 5624 bytes
SHA-256: cb20e0f0b48ce902b81efd9c41b1afa1ffec7c64997e84410457b8760ff64a90
font_01_sfnt_off0000f10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10A 2904 bytes
SHA-256: 9ee7db78a680e954fc83827cb3b0ef6d483254f0c29ad6cde1ee3630ce45ecab
font_02_sfnt_off0000fcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFD 10736 bytes
SHA-256: 543ecdcd9a73364dc9e8c5b6c87de01b8ff7199c79008021602311f8aad04b09

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