Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb2436a4331cb983…

MALICIOUS

PDF

75.0 KB Created: 2021-03-18 08:00:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fe7f8772db2468466c6def10fdbeadf SHA-1: 9b968b041813629fafd805f06add57ebe33bb540 SHA-256: cb2436a4331cb983604c370d0dab56f9820df1d1573160ff2e6afaa3a1d78507
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a domain that appears to be involved in distributing malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, suggesting an attempt to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/strik?utm_term=how+to+reset+w211+service
    • https://cdn.sqhk.co/danexili/j4ha8ig/miroir_projector_m20.pdf
    • https://cdn-cms.f-static.net/uploads/4420034/normal_603ca8ed0271b.pdf
    • http://xilibinebosapeg.mywebcommunity.org/sadaba.pdf
    • https://cdn.sqhk.co/turovonunido/bjgie4y/japevirojalune.pdf
    • https://tolawururajetam.weebly.com/uploads/1/3/4/8/134883146/468449af57c91.pdf
    • https://cdn-cms.f-static.net/uploads/4471686/normal_60150fcf39082.pdf
    • https://static.s123-cdn-static.com/uploads/4417824/normal_5ff03ca953756.pdf
    • https://cdn.sqhk.co/telazaje/hdkhgCZ/star_realms_kickstarter_promo.pdf
    • https://kefubawivamati.weebly.com/uploads/1/3/5/3/135304753/piwivadalipe.pdf
    • https://cdn-cms.f-static.net/uploads/4393197/normal_600f9dc925165.pdf
    • https://cdn.sqhk.co/jumupebuvi/ngdajbH/napozego.pdf
    • http://maritimog.medianewsonline.com/wazitobadubamumevatijesa.pdf
    • https://static.s123-cdn-static.com/uploads/4471996/normal_5fca598bade8d.pdf
    • https://falevuwutote.weebly.com/uploads/1/3/5/3/135301590/rabevidum.pdf
    • https://cdn.sqhk.co/lekusovu/gigchhJ/vumilumujakebi.pdf
    • https://benokonafininu.weebly.com/uploads/1/3/4/6/134606635/98c79.pdf
    • http://nesebonuvobeju.getenjoyment.net/judixeduxolatatowiwum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5244254f-0da8-4206-b4e6-0f659d27d956/9266250432.pdf
    • https://uploads.strikinglycdn.com/files/da823b3f-9930-40d0-a1c3-4ebfe7972111/lizukuvasidefom.pdf
    • https://uploads.strikinglycdn.com/files/28971b8e-c408-4ccc-8143-c4f970dc767b/43739180947.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e916.bin
408d2fcb6497897c6663deb092887ebdea65b1f4f6a4c9b3f7ee58f2648ce7be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE916 4848 bytes
font_01_sfnt_off0000f9c2.bin
5211f764aa9d93378c15a710dd067e865577a21a4a619c82cb8ccf662356cddb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C2 10868 bytes

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