Malicious PDF — malware analysis report

Static analysis result for SHA-256 2433f4664f80bed8…

MALICIOUS

PDF

81.7 KB Created: 2021-02-26 17:31:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 68bfefa33344eabc783426f009dd5a2b SHA-1: dbd0e92d741fd02dc1d8e12884ff95d1ce2aedc6 SHA-256: 2433f4664f80bed8d404864d28f4b09dffed3d5e8d4edbd5386bab3a8e474f33
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting, indicative of a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

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://jumiwimov.ru/strik?utm_term=why+are+lines+of+latitude+called+parallels PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467038/normal_601da4806b1fc.pdfIn PDF document text
    • http://gelchlen.fun/toefl_listening_sample_testx3uug.pdfIn PDF document text
    • https://japugaze.weebly.com/uploads/1/3/5/2/135295186/c54fbfe7f621ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410678/normal_603844c233ded.pdfIn PDF document text
    • https://nudiwosesi.weebly.com/uploads/1/3/4/3/134317077/vumotiwupumatuxof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483836/normal_603637649f298.pdfIn PDF document text
    • http://yogist.fun/film_boneka_chucky_2017_sub_indo5ezry.pdfIn PDF document text
    • https://cdn.sqhk.co/mekerijiwuv/ticia1N/zifekevatod.pdfIn PDF document text
    • https://pitalozel.weebly.com/uploads/1/3/1/3/131384414/govorutarevoze.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/ion_profile_usb_turntable_software.pdfIn PDF document text
    • http://dotavulilego.mypressonline.com/how_to_learn_silent_language.pdfIn PDF document text
    • https://sididipukiwe.weebly.com/uploads/1/3/1/3/131398020/zezadukifokev.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/Z4ZLhiZ/the_countermeasure_to_tiny_fragment_attacks.pdfIn PDF document text
    • https://cdn.sqhk.co/naxusepimosa/UFgjihW/study_skills_worksheets_for_high_school_students.pdfIn PDF document text
    • https://votokivefanatu.weebly.com/uploads/1/3/1/4/131453133/luxuwavut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lijowavatajo.myartsonline.com/dymo_letratag_lt-100h__tape_160x160dpi_label_printer.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_off0000ff59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF59 5360 bytes
SHA-256: 92fa4b59ef75f624fa95a2488157292239d8f23972d6ddbd23342fcbb550625e
font_01_sfnt_off000111a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A3 12076 bytes
SHA-256: 5701fd9b072415dfa169af333423b730a95c57ae9f5f1349380db03723f87d0a

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