Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9a5a2bddcf3500…

MALICIOUS

PDF

77.5 KB Created: 2021-02-26 14:44:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 427fbada710476d0a3eb6e6147019e33 SHA-1: 116a3510a28f42647acd39c313e59e1e65a77d1a SHA-256: 5f9a5a2bddcf350099b00f9d05e0b7218433a025318ea800f427b65466a92c92
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO purposes, likely to obscure malicious redirects. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://lozipotod.ru/strik?utm_term=war+and+peace+movie+1966+trailer PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368770/normal_5ff915218bad4.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/pobelema.pdfIn PDF document text
    • https://cdn.sqhk.co/pidodalatip/ejgn1zD/kisuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409103/normal_6001266fb30bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409107/normal_60012e35273b7.pdfIn PDF document text
    • http://betijeduw.getenjoyment.net/ray_ban_black_aviator_sunglasses_price_india.pdfIn PDF document text
    • https://cdn.sqhk.co/podoxato/hbjeZJk/62105666788.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/77327983568.pdfIn PDF document text
    • https://xarudaxukisa.weebly.com/uploads/1/3/4/0/134018653/e894621.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/1000_and_1_nights_summary.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/bexavadimezilederenuleve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_5fe78d32c451a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_5fd09f87f34ae.pdfIn PDF document text
    • https://fidifeso.weebly.com/uploads/1/3/1/4/131408027/1a74e2e0.pdfIn PDF document text
    • http://haustova.com/73780425176taqnt.pdfIn PDF document text
    • https://cdn.sqhk.co/dakagugi/ggOjhhe/hay_days_2020_atkinson_ne.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/tiiwgiM/vidasexexegov.pdfIn PDF document text
    • https://vikilegopufuber.weebly.com/uploads/1/3/4/5/134588451/822596.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kopolug.myartsonline.com/calendario_escolar_2019_y_2020_sep.pdfIn PDF document text
    • http://nejarisiwudu.atwebpages.com/94320987976.pdfIn PDF document text
    • http://wenares.myartsonline.com/bofofifon.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_off0000f156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 5476 bytes
SHA-256: bd4396ed0052dfd2a42b63563111823b328f56acaa880b4948db4d809170bc47
font_01_sfnt_off000103f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F5 10732 bytes
SHA-256: dea62a811bfdb8e8d8c38abc333223df4913234260900cf3fe769eb4f378e471

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