Malicious PDF — malware analysis report

Static analysis result for SHA-256 93128fb938ebec17…

MALICIOUS

PDF

75.3 KB Created: 2021-02-27 22:21:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: f21d50843f1c3a17ee8be40e6fc580b9 SHA-1: b87dd0c6f3652afba25aec3ab60e2e6b36d2602f SHA-256: 93128fb938ebec1709b84058ff9de178e7a0cc5039d509a8511cc71f5f57e2ae
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm on disposable hosting. The PDF contains numerous external URIs, with one prominent URL being https://vilenefex.ru/strik?utm_term=dell+optiplex+7010+sff+processor+upgrade, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and URI usage are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=dell+optiplex+7010+sff+processor+upgrade PDF link annotation
    • http://waneboto.66ghz.com/mobile_legends_pc_game_loop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450418/normal_5fe41227a8027.pdfIn PDF document text
    • http://nimojojisox.22web.org/90043649141.pdfIn PDF document text
    • http://leree6.club/gdpr_photography_consent_form_template_freeipyug.pdfIn PDF document text
    • http://podarokinsta.online/73737484184udncd.pdfIn PDF document text
    • http://ketrovk.xyz/ludasikirafedugizoxmm7rc.pdfIn PDF document text
    • http://lofitner.buzz/blades_and_rings_forumaluc7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wepinipinalojud.epizy.com/canon_photo_editor_for_mac_free.pdfIn PDF document text
    • http://lenixad.epizy.com/2895579228.pdfIn PDF document text
    • http://gugamofizuxeg.epizy.com/tinujavalevo.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/56982151127.pdfIn PDF document text
    • http://zobawukesilebaf.epizy.com/lidujemukurib.pdfIn PDF document text
    • http://likasiz.epizy.com/wodalimosuzapularu.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/69589375840.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/empresa_electrica_quito_reportar_daos.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_off0000e833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE833 5664 bytes
SHA-256: 08984b00a8826c4afa953631ac4b1bbc4cfb39f07c0f6d43a1ed0315d746e659
font_01_sfnt_off0000fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 10676 bytes
SHA-256: a3ae9d1e733313c354cea960d2a44f1e5754bf18e935cc810058ff2a4aa314dd

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