Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b29d1a648c0550…

MALICIOUS

PDF

85.9 KB Created: 2021-02-05 10:34:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d662806bca999e461b3cd5fac976d73f SHA-1: 3b054e0dbbc9e7f82ce862b52069bfdd4787f63c SHA-256: c5b29d1a648c055054205ab4c9734b68e0afb207a5b52c01e9f4bee5b912ba15
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs and embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a game mod lure, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/aws?utm_term=moto+bike+race+game+mod+apk PDF link annotation
    • http://skidki-day.shop/lituxasemifnahl5.pdfIn PDF document text
    • http://app-3null.com/448064310643i1uv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374199/normal_600d9b10bf28d.pdfIn PDF document text
    • http://vizit.store/on_eagles_wings_piano_sheet_musicolu8q.pdfIn PDF document text
    • http://feyakast.online/mobile_catering_business_planubak4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368770/normal_5ff9128d44f90.pdfIn PDF document text
    • http://datulosuwila.iblogger.org/werewolves_within_trophy_guide.pdfIn PDF document text
    • http://dvestideyli.xyz/279909968056npqw.pdfIn PDF document text
    • http://helpforteam.com/az-300_dumps_free32p8d.pdfIn PDF document text
    • http://mgacessoria.online/8139777719njehw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_601bacd52fa19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459166/normal_5fe121e0ae87f.pdfIn PDF document text
    • http://fdvsefwfrw.space/liderazgo_john_macarthur_gratisyqi6j.pdfIn PDF document text
    • http://gogotmif.space/determine_the_theoretical_yield_and_the_percent_yield_of_ethanol_if_684bffyh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384307/normal_600211df42110.pdfIn PDF document text
    • http://lusaxesa.iblogger.org/rexokupoxadejosixosolereb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366406/normal_5fca7b10b2368.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459060/normal_5ffa22c771e5b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuzebelinebofe.epizy.com/58035894826.pdfIn PDF document text
    • http://lirinuguwe.rf.gd/revdl_candy_crush_saga_mod_apk.pdfIn PDF document text
    • http://foxokaxej.epizy.com/malcolm_baldrige_performance_management_model.pdfIn PDF document text
    • http://zuvetimimu.rf.gd/20290681848.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011fbb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11FBB 23900 bytes
SHA-256: 4f086b56ab66d9414d6e5a5e3960f0ac4e2d60a85fe0c55bd2f5068a9a65d465
font_00_sfnt_off0000e8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E0 5392 bytes
SHA-256: c2583ac0cb47598b6c37b35813e0533be908e4d33d9e1d1a94f5b1b9b0de0f28
font_01_sfnt_off0000fb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2B 10712 bytes
SHA-256: 8e5de0d7ba189530ad7948801b36b22598415719d466c7ad259741119b0b7542

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