Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a3c3a3bbb3e50e…

MALICIOUS

PDF

67.9 KB Created: 2021-03-21 01:51:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a88ef4cb8c15bff272dd614062ea65d0 SHA-1: 2bb891a11088699ca859224406c039e566dd9738 SHA-256: c2a3c3a3bbb3e50e8955c00cfd59eb01c2a1774a01790aac9c0243cafbf5d58f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded URLs and the nature of the link farm are the primary indicators of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://jumiwimov.ru/strik?utm_term=god+bless+my+daddy+lyrics+chords PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472221/normal_6033095464cfc.pdfIn PDF document text
    • https://bivunuse.weebly.com/uploads/1/3/5/3/135392281/f1e11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500438/normal_6034090b3e835.pdfIn PDF document text
    • http://pedazupemadid.22web.org/kefutibubeturosugutevosux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455902/normal_6048477432836.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475376/normal_5fff598715f6d.pdfIn PDF document text
    • https://rimofunoduw.weebly.com/uploads/1/3/4/5/134525219/kagodidoganono.pdfIn PDF document text
    • https://tubonizuruzoxuk.weebly.com/uploads/1/3/0/9/130969435/60caf942b79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417140/normal_601ff3ef40187.pdfIn PDF document text
    • https://pituluwo.weebly.com/uploads/1/3/1/4/131437949/kumozuwutebizul.pdfIn PDF document text
    • http://sekewutu.iblogger.org/california_dreaming_ukulele.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503033/normal_602a9b6b6127c.pdfIn PDF document text
    • https://nutikatike.weebly.com/uploads/1/3/4/6/134601603/bevimutop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5fd6798600c6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466391/normal_600d99f29604f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450636/normal_5fceb6222d8d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454432/normal_5ff5ac7746833.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426407/normal_6016204f14bcf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390995/normal_5fcf404642975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474223/normal_602d890ec9087.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gidojujejotimoj.epizy.com/87054585640.pdfIn PDF document text
    • http://pidosowot.epizy.com/doodle_god_apk.pdfIn PDF document text
    • http://jovuwumadileweb.rf.gd/52567818892.pdfIn PDF document text
    • http://jesaruge.epizy.com/civil_fe_exam_reference_manual.pdfIn PDF document text
    • http://norevejuvo.epizy.com/meworolisupetabakizupazef.pdfIn PDF document text
    • http://fikakoba.rf.gd/94338663634.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_off0000cdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBA 5452 bytes
SHA-256: ac43eeaab6cb8d5dd2cd0e0626093c2b00273ab25ee19e1f2e591627922616e4
font_01_sfnt_off0000e019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE019 10008 bytes
SHA-256: 165643f81e15102bf3144322291964c3868c35613338feac666f0484caa099c1