Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3234f062a86f1f…

MALICIOUS

PDF

78.4 KB Created: 2021-04-15 22:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5bac89c3320485e9768af30979c03ac6 SHA-1: 24347d283d5a8b6350913c06f09c1d1d6acdb14c SHA-256: bf3234f062a86f1f62234f469597e7f0d49dbcb9abe76f116ce1e30ebfccb70e
186 Risk Score

Malware Insights

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

This PDF file is classified as malicious, exhibiting characteristics of a link farm designed to redirect users to external sites. The heuristics indicate a high volume of links, many pointing to disposable hosting, and the ML classifier strongly flags it as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lead users to potentially harmful content, possibly for phishing or malware delivery.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/strik?utm_term=how+to+write+a+3+paragraph+essay PDF link annotation
    • https://wefizaxire.weebly.com/uploads/1/3/0/9/130969527/17693d90452.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416321/normal_6000a7c43c77d.pdfIn PDF document text
    • https://nekatiru.weebly.com/uploads/1/3/2/6/132695473/fukapojewe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375522/normal_6063575fc7bf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421476/normal_604d62d7506e6.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/fGhbdLs/physics_class_9_chapter_1_mini_exercise_solutions.pdfIn PDF document text
    • https://cdn.sqhk.co/worupageke/gdif4M5/homeroom_classroom_signs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454971/normal_6003dbdb36d75.pdfIn PDF document text
    • https://cdn.sqhk.co/mivufarowiwi/4geieja/xowojubexejewowaxejit.pdfIn PDF document text
    • https://ruxevikupasej.weebly.com/uploads/1/3/4/6/134663562/xodigijuximewunola.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418970/normal_6021f03715e7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454436/normal_6064a7514965b.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/hajbdib/tema_masha_e_o_urso_festa_infantil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_b2ee9f45f99a4822b249fe7793f7e68e.pdf?index=trueIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_00c9a30d5bfd4be8a11aab881e364a11.pdf?index=trueIn PDF document text
    • https://e148473a-3d1a-46f8-b788-fbc1f5af68d4.filesusr.com/ugd/e1e70b_5c2338b4eead41609105f9f32e831d65.pdf?index=trueIn PDF document text
    • https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_f8f2180282544253a5987f2d4b5e7230.pdf?index=trueIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_49e89d5a3b9349dba17df1b19bcb823b.pdf?index=trueIn 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_off0000f8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B0 5368 bytes
SHA-256: b2b540f147c4ebd01bb88dfbde8ee7e8ff92863a0b264a2d6ac0be86efb71f52
font_01_sfnt_off00010b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B05 9948 bytes
SHA-256: 3952f1cb2618d5f48c6d88ab73cd535e512f4d7731411eec85a4640c24804177

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