Malicious PDF — malware analysis report

Static analysis result for SHA-256 5361ed09a2bf0af5…

MALICIOUS

PDF

73.8 KB Created: 2021-03-09 23:29:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f283935ccdfff1cc2e5271587079ecc5 SHA-1: a7f395aa7915e9e71688284e878e62dff63838dd SHA-256: 5361ed09a2bf0af561b63e0c33a13d50af89a500f815238bb9d6b886ed82719f
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://jottigo.ru/strik?utm_term=pdf+probability+density+function+cdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483610/normal_6022cea28bbde.pdfIn PDF document text
    • http://afracheat3.xyz/nomemenexivuvadamueog3o.pdfIn PDF document text
    • http://relibafogat.sportsontheweb.net/rilulepujaxaz.pdfIn PDF document text
    • https://xapowukugo.weebly.com/uploads/1/3/4/7/134702937/4422602.pdfIn PDF document text
    • https://maxawoxemun.weebly.com/uploads/1/3/4/6/134615094/wiwubogonudofijigaxu.pdfIn PDF document text
    • https://danizejoj.weebly.com/uploads/1/3/5/9/135990884/5119383.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/85940526280.pdfIn PDF document text
    • http://gouliwer.online/nitowabupixuzvexny.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393349/normal_5fdd5d9e89d05.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/jovimosubexudedixawo.pdfIn PDF document text
    • https://mebusogaduvorit.weebly.com/uploads/1/3/0/9/130969439/863f39fc8.pdfIn PDF document text
    • http://gazizelasama.getenjoyment.net/wusumawopelifivafonixobaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366347/normal_60108692316f7.pdfIn PDF document text
    • http://greatmasters.biz/hope_all_is_well_with_you_formalaimhe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486192/normal_60381f1643073.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_016defbb9fc14577af985caaaf26486c.pdf?index=trueIn PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_f2054dcd3531455186f1d1bcc9a31e3c.pdf?index=trueIn PDF document text
    • http://bovemuw.epizy.com/derupaketezudepiziz.pdfIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_3b8da76267334209a6b271f13558598a.pdf?index=trueIn PDF document text
    • http://rizivubonulej.atwebpages.com/whos_afraid_of_virginia_woolf_full_movie_free.pdfIn PDF document text
    • http://muzasedek.epizy.com/neopost_postage_meter_locked.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_off0000e19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19E 5392 bytes
SHA-256: 7a3ba76b7e474685aea9b934d4f4430bff6a579bebbb2364eb6916d11dbe31d6
font_01_sfnt_off0000f407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 11120 bytes
SHA-256: 2e38f631f114975c3c2e8b40c064d845574d7c89892babae7dd06d44b5d87755

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