Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5c7ede2138167e…

MALICIOUS

PDF

77.1 KB Created: 2021-03-22 23:48:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 8a8f0018e887fffaab22f2bf4202c8fc SHA-1: b8e202b2f37e1161c9c0eb01affe7d1f9100f9ba SHA-256: 5e5c7ede2138167e329ef46449bab19e44079f1dcdc4e2a7a1da6a82e632bb47
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The primary URL, zajinet.ru, appears to be part of this scheme, potentially leading to phishing or malware distribution. No scripts were extracted, but the PDF structure and numerous external links point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/award?keyword=indesign+reduce+pdf+file+size PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4456135/normal_60015fac35c2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420592/normal_604e1d2032131.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/iaUxghj/75690655058.pdfIn PDF document text
    • https://lekumoga.weebly.com/uploads/1/3/2/6/132683130/288757.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393349/normal_601b4464446cf.pdfIn PDF document text
    • https://tiwokixaxuvap.weebly.com/uploads/1/3/4/2/134235176/9109039.pdfIn PDF document text
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/1720951.pdfIn PDF document text
    • https://rubuvewoxuvima.weebly.com/uploads/1/3/4/8/134873715/meloguligedudap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458838/normal_60281530f333f.pdfIn PDF document text
    • http://pakatisijelu.iblogger.org/tuwovug.pdfIn PDF document text
    • https://mefevujeloz.weebly.com/uploads/1/3/4/3/134317202/9880816.pdfIn PDF document text
    • http://jefuxifutubanal.iblogger.org/howard_gardner_inteligencias_multiples_libro_gratis.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/cqhj0gd/nunivadawurokara.pdfIn PDF document text
    • https://cdn.sqhk.co/xegogeji/a3jhO63/bihar_stet_notification.pdfIn PDF document text
    • https://lodobapidadisu.weebly.com/uploads/1/3/1/1/131164557/50ded3c.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/MwU3hdA/2020_fantasy_football_rankings_espn.pdfIn PDF document text
    • https://cdn.sqhk.co/temazajilib/gCKSrwo/newazigosigutulugixu.pdfIn PDF document text
    • http://jatuligirez.22web.org/alvida_naat_status.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuwutif.rf.gd/82125289658.pdfIn PDF document text
    • http://kafalemanam.epizy.com/92024628044.pdfIn PDF document text
    • http://darafefe.rf.gd/35722361415.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_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 5100 bytes
SHA-256: 07f562342d0325484cf288db86035022ec8a33f507698e9844dfdde60e4f9f6d
font_01_sfnt_off0000ffb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB2 11004 bytes
SHA-256: 032fa9f15acc5f7402d43fe5522db9058e3eb961d332c84269a619220e485744

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