Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f601c4f3435c11a…

MALICIOUS

PDF

74.3 KB Created: 2021-04-26 16:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 55de48904798aaacf82126e3feb51ae8 SHA-1: 43e7118a98d3401e31a4193c3712052cfc729dd6 SHA-256: 9f601c4f3435c11a909c342b0dab1692e0da2c54f0865d08bab64000b2d986df
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting it is part of a link farm or SEO spam campaign. The primary URL, https://midufefew.ru/strik?utm_term=ley+de+ohm+ejercicios+circuitos+en+serie, is likely used to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://midufefew.ru/strik?utm_term=ley+de+ohm+ejercicios+circuitos+en+serie PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391024/normal_601b522335cbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485299/normal_601910d12163d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374532/normal_602555eae8d5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405184/normal_60620548d9081.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422180/normal_60643813f2e2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454562/normal_6063f8506017a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366982/normal_5fdf8c94b80cd.pdfIn PDF document text
    • http://lezofifividex.scienceontheweb.net/pupasixukiru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490746/normal_5feb55766f079.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485296/normal_5fe529cd89a31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409103/normal_6047e0cc88035.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386606/normal_60514b3935235.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490528/normal_5fe5a58c7621d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://defakulid.atwebpages.com/6568302454.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_710a95a587a04623bba2f0ff4525d922.pdf?index=trueIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_4dc2a1c5ebbb40feace8ce44ee0f3054.pdf?index=trueIn PDF document text
    • http://bowegasobufur.myartsonline.com/basic_mechanical_engineering_interview_questions_download.pdfIn PDF document text
    • https://73b3f487-90f5-41a6-bf44-750372f72efd.filesusr.com/ugd/39e8d0_d5c9e14f65ec447cb38e944a9d23bed6.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_off0000e022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE022 5056 bytes
SHA-256: 361fd7e6f8febda60ac55491cbaccd80ca4c9c3694e85c0c40c788a3953bad63
font_01_sfnt_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 12748 bytes
SHA-256: cfbc73d6caa2d5e401058c06cf5525d449ffb0d5486de48182ff19932a027371

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