Malicious PDF — malware analysis report

Static analysis result for SHA-256 875ff9da4afbbd16…

MALICIOUS

PDF

65.8 KB Created: 2021-05-16 22:40:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f6dfa109f9d4ca79d73075ec1f60771b SHA-1: ccaa66df43c8ce2b0d74c8e5478e25f50a7889e3 SHA-256: 875ff9da4afbbd1698ebf8accb0f198c8f25ef7ef7755520c38b7efc655cbe0d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to redirect users to numerous potentially malicious or spam-related URLs.

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://bologen.ru/strik?utm_term=faber+piano+adventures PDF link annotation
    • http://kosodidaxelo.22web.org/dimplex_blf5051_installation_manual.pdfIn PDF document text
    • https://sitimewodojex.weebly.com/uploads/1/3/1/8/131856527/7416083.pdfIn PDF document text
    • http://lotukaguw.sportsontheweb.net/4584814877.pdfIn PDF document text
    • http://dadefuxafovub.22web.org/65953309528.pdfIn PDF document text
    • http://somubuzesixuwun.getenjoyment.net/human_activities_that_affect_the_environment_essay.pdfIn PDF document text
    • https://zolegezuboz.weebly.com/uploads/1/3/4/4/134462972/2864595.pdfIn PDF document text
    • https://pemejelusapi.weebly.com/uploads/1/3/1/3/131398576/tepekolikox.pdfIn PDF document text
    • https://vewewiganivobob.weebly.com/uploads/1/3/4/8/134852084/joganuja.pdfIn PDF document text
    • https://jojeditisiteso.weebly.com/uploads/1/3/1/6/131606373/9c53079f171d.pdfIn PDF document text
    • http://sufawevugut.mywebcommunity.org/abdul_karim_soroush_books.pdfIn PDF document text
    • https://xavodujur.weebly.com/uploads/1/3/5/9/135972692/8a427f2608a.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/46630585676.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_21be77a51d2c49d5b4de27da8d67ac3e.pdf?index=trueIn PDF document text
    • http://mavadapeganitew.epizy.com/mosupuvewufulipakir.pdfIn PDF document text
    • http://tujupifirafadus.myartsonline.com/57127897106.pdfIn PDF document text
    • http://magajavopisili.epizy.com/lavarropas_ariston_carga_frontal_manual_de_uso.pdfIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_115c62ff3748493997e31539861d03ae.pdf?index=trueIn PDF document text
    • http://vinudade.rf.gd/plantillas_para_boca_de_pescado_en_tuberia.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_off0000c411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC411 5076 bytes
SHA-256: 953e62c27adaffdec8cba1f2a3180846c850afd4ed5d956bd168b14014931584
font_01_sfnt_off0000d55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55E 10456 bytes
SHA-256: cc885df98363cf4b30db4ce9d255ec88e74a6fe71124e534fa235dc4d717d5a6

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