Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6859cc9b632386a…

MALICIOUS

PDF

77.3 KB Created: 2021-02-21 21:33:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 934aa532a384fb1da85b23b0f9729847 SHA-1: d6f59ac062d9b0a488c0442658edc884f690928e SHA-256: c6859cc9b632386aa3bdc9bd4b53a8c113b080ee8094905552fe206bdd791d1e
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous external URLs pointing to various domains, suggesting it is used to redirect users to potentially harmful websites. The presence of 'utm_term' parameters in some URLs further supports the idea of tracking or directing users to specific lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/strik?utm_term=what+order+should+i+read+the+once+series PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370278/normal_6004afccf19d5.pdfIn PDF document text
    • http://ru-dev.xyz/uber_eats_driver_reviews_edmontonli3b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454051/normal_5fe2505da7004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491451/normal_5fd1489b038ff.pdfIn PDF document text
    • http://fapseo.ru/4544622138e2nys.pdfIn PDF document text
    • http://asia.kiwi/momirikanivijebybj5d.pdfIn PDF document text
    • http://avtovishki-msk.ru/16981426846a8u0g.pdfIn PDF document text
    • http://b4shop.icu/psychology_sensation_and_perception_quiz_answerslbr05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387814/normal_5fe93b67e2bdd.pdfIn PDF document text
    • http://nofuwev.iblogger.org/how_to_get_fire_stick_to_control_tv_volume.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwipabobatu/bQxigic/ringworm_rash_treatment_at_home.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409621/normal_602c7c714a4be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417983/normal_5fc91028e5e64.pdfIn PDF document text
    • http://copyrightshelpscenters.com/single-step_vector_worksheet_answers6xdf0.pdfIn PDF document text
    • http://skameyki.club/nebesosumpew8j.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/FjfbZ5C/13456925633.pdfIn PDF document text
    • http://santand-es.com/eversafe_foam_fire_extinguisher_manualktjx3.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/gVJgeyB/nezerizodutifevoviduwag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467274/normal_5fcef3c55934e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000eeba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBA 5040 bytes
SHA-256: d21bd433045ec174411fc5b97e14b88fd7143b2a536b40c93cd59d2630dc3773
font_01_sfnt_off0000ffe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE2 11676 bytes
SHA-256: 095780ef391769bc116e1ca68c19776cad733931794c85dec513e8f72b87e8e3

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