Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9c9c5bd147c2d6…

MALICIOUS

PDF

80.9 KB Created: 2021-04-03 19:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c94832560cff7159c3e98b13b841793a SHA-1: 2bd6ba1957fb8bd919a5085b26f890bd90a13c9d SHA-256: 7b9c9c5bd147c2d663d6de60ea61f0980388fedd06dee32debcf9fe133d89856
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, designed to redirect users to external URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing. The embedded URL 'https://xajibur.ru/strik?utm_term=who+makes+insignia+fire+tv' is the primary indicator of this phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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://xajibur.ru/strik?utm_term=who+makes+insignia+fire+tv PDF link annotation
    • http://worozoxiw.sportsontheweb.net/54431360940.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476939/normal_60377392b9f52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394073/normal_602f8fc61b442.pdfIn PDF document text
    • http://pc-remont.website/casio_ctk-7000_manualb05i6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463812/normal_604acaa0eda6a.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/borisav_stankovic_uvela_ruza.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/cassava_production_guide_in_the_philippines.pdfIn PDF document text
    • http://hellesypakk.online/walexukulijonefomakujedo3y9jn.pdfIn PDF document text
    • http://wacc-cat.org/aadhaar_software_for_pcyge9m.pdfIn PDF document text
    • http://debopuforu.22web.org/genero_enterobacteriaceae.pdfIn PDF document text
    • http://drnextact.xyz/kuvurebuwimowavodilijososte7h.pdfIn PDF document text
    • http://ketotreno.buzz/out_of_the_loop_cat_memefg9kx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/pumibowoze.pdfIn PDF document text
    • http://tesekinapoden.epizy.com/94603429895.pdfIn PDF document text
    • http://nazifaba.rf.gd/tipos_de_acoso_escolar.pdfIn PDF document text
    • http://joxepivebafugig.epizy.com/3219053116.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/27074177429.pdfIn PDF document text
    • http://lipidojomodu.rf.gd/assembleia_da_repblica_de_moambique.pdfIn PDF document text
    • http://pevajaxujob.epizy.com/68346486088.pdfIn PDF document text
    • http://zafurug.epizy.com/12659181603.pdfIn PDF document text
    • http://mifojizu.myartsonline.com/melhores_cursos_de_ingles_online_gratis.pdfIn PDF document text
    • http://xuwunokebisul.rf.gd/evil_dead_tamil_full_movie_tamilrockers.pdfIn PDF document text
    • http://jezanijumoz.epizy.com/logitech_k270_keyboard_number_pad_not_working.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_off0000fd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD32 5284 bytes
SHA-256: f9b0822012599870b218fbac7f8086e0ab4f42fe8c11955857e48c2fca758177
font_01_sfnt_off00010f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F14 11632 bytes
SHA-256: 44c0b146ab1f5ceb85ff3327240741faf3748e58195ec54f68f524c06be062d7

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