Malicious PDF — malware analysis report

Static analysis result for SHA-256 680d6c114405ec90…

MALICIOUS

PDF

75.2 KB Created: 2021-03-01 08:37:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6f77b3091f1e9453d76e9d8c4e847714 SHA-1: e8336b6ca81131f1add793d15b0ed200678405e5 SHA-256: 680d6c114405ec90978fc024458bd340fd4b5d4d14994bac25d0dab30183f8f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The heuristics identified the PDF as a link farm on disposable hosting, with numerous embedded URIs pointing to various domains. The primary malicious URL identified is https://baarspo.ru/strik, which is likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=second+green+revolution+in+india+upsc PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452376/normal_5ff5390f43b50.pdfIn PDF document text
    • http://miiliioner.xyz/dell_u2410_monitor_reviewfjo34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450635/normal_60016b0a58ca1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413578/normal_5fd1df57018f0.pdfIn PDF document text
    • http://pevetune.66ghz.com/financial_ledger_template_excel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481418/normal_5fd10edaeb444.pdfIn PDF document text
    • http://inscarusa.info/how_much_does_a_solar_watch_battery_cost2tyap.pdfIn PDF document text
    • http://trenolgia.buzz/routing_and_switching_essentials_v6rl71k.pdfIn PDF document text
    • http://tibetterrier.ru/salejaludnyp0.pdfIn PDF document text
    • http://creditscoreusa.info/engineering_drawing_mcq_questions_with_answers08zew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457320/normal_6032b92eccf93.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gadoxijumulop.epizy.com/amulet_book_7_firelight.pdfIn PDF document text
    • http://demiwadipojaz.epizy.com/midekekovukasofelukarawo.pdfIn PDF document text
    • http://fewuzefar.rf.gd/tumaczenie_angielski_na_polski.pdfIn PDF document text
    • http://zopiselewanut.epizy.com/14158097455.pdfIn PDF document text
    • http://jodewejuwuw.epizy.com/joxetexudurojibifulum.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_off0000e80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80C 5404 bytes
SHA-256: c46ec62b5a1add7477632551d75ee665d139b62c52429977f29b931fb00de89b
font_01_sfnt_off0000fa82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA82 10876 bytes
SHA-256: 5b07c1ba9c7ce642e43339dcb325c7a0f08303f0f20a4d668bc7c7261aa49fb8

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