Malicious PDF — malware analysis report

Static analysis result for SHA-256 94e6fadf044fa487…

MALICIOUS

PDF

64.7 KB Created: 2021-02-11 23:58:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3204561b441cc8dd99aeadd04d35106f SHA-1: fdbf24c4bd53ac504b41d60df23ecc0151c78c7e SHA-256: 94e6fadf044fa487c96c950c141333379f3edac4b2f787c1c2aaf45957478e11
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, and heuristic analysis indicates it functions as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

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://maypoin.ru/wix?keyword=spectrum+math+grade+6+chapter+4+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382952/normal_5fe55996310a5.pdfIn PDF document text
    • https://cdn.sqhk.co/feduvefas/gdhhXhe/doomsday_clock_live_2020_in_new_york.pdfIn PDF document text
    • http://rkconstructionsucks.com/twisted_mountain_climbers_benefits5es50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478664/normal_60142e12c345e.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/c7UKYD3/3d_drawing_games_free_online.pdfIn PDF document text
    • https://muxiduxipa.weebly.com/uploads/1/3/5/3/135319221/vezinu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369923/normal_6002b4247df85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459326/normal_5fd156157f234.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413850/normal_5fdd2181c7d96.pdfIn PDF document text
    • https://nefolebar.weebly.com/uploads/1/3/4/4/134400051/3119303.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475204/normal_5ffa86e54adce.pdfIn PDF document text
    • https://fegajasun.weebly.com/uploads/1/3/4/5/134502742/3802777.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418590/normal_5fcaaf0ad4a4e.pdfIn PDF document text
    • http://probkin34.xyz/58002719607e1ywq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412767/normal_600a4f168cbe1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nexaware.epizy.com/bituva.pdfIn PDF document text
    • http://lizaduguxo.epizy.com/infant_constipation_treatment_guidelines.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_off0000bf53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF53 6060 bytes
SHA-256: f68bb77608410a04a9aee5597adf0fa427e865f60a2606ee4a7d5cce7cda6af4
font_01_sfnt_off0000d3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E0 9772 bytes
SHA-256: 7754633485f2c76adb0d433b712f7253f9747546f342b411c42f580e04f9e3ad

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