Malicious PDF — malware analysis report

Static analysis result for SHA-256 658d63e8b10d3793…

MALICIOUS

PDF

100.1 KB Created: 2021-03-29 05:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11f35f53ab8c84cea05516b2919cf909 SHA-1: ec2c4fc4db706dd782d432d5bc8f4ac301760919 SHA-256: 658d63e8b10d3793300c3cbc7ab98020fcadde2b76b3fd22563449623df6a5e6
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, characteristic of a link farm used to distribute malicious content. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly suggests the document's purpose is to trick users into believing they will receive a prize or parcel, which is a common advance-fee fraud tactic. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://resalured.ru/strik?utm_term=how+much+does+it+cost+to+run+a+game+server
    • http://xorabawik.medianewsonline.com/xewuxixajebotugepuditopo.pdf
    • https://govobozof.weebly.com/uploads/1/3/5/3/135315692/2dc850891e.pdf
    • https://cdn-cms.f-static.net/uploads/4424347/normal_5feaed2772828.pdf
    • https://cdn.sqhk.co/madufuxenuw/kLgcohf/30696163117.pdf
    • https://sefariduzaki.weebly.com/uploads/1/3/4/6/134665623/zuwexamuzi-gefojaju-gupuvusirisinur-wazevefozogixe.pdf
    • https://jegobagugixados.weebly.com/uploads/1/3/4/8/134858953/107dc154c931223.pdf
    • http://zakemelevij.iblogger.org/bleacher_report_nfl_predictions_week_13.pdf
    • http://tiwilofojifig.sportsontheweb.net/88414700523.pdf
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/rezenala.pdf
    • https://cdn-cms.f-static.net/uploads/4458125/normal_6014f8fe6fa4f.pdf
    • https://viwajojavejad.weebly.com/uploads/1/3/1/8/131858172/0518c3cf95.pdf
    • https://cdn.sqhk.co/xifusajexom/Wk1jjhc/cross_border_transactions_llc.pdf
    • https://babobulelemin.weebly.com/uploads/1/3/5/3/135344535/fogutijupuper.pdf
    • https://cdn-cms.f-static.net/uploads/4490539/normal_604657fd3006e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00014b12.bin
7b773b49e507e787346117bad112dc1861dddad3d214669179999730b7152d2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B12 5436 bytes
font_01_sfnt_off00015d76.bin
06eaef196e2b3817d9ad6d647be0c5a7d17eab3c286066fec3a9402b981f31f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D76 11156 bytes

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