Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9467d13c416d71…

MALICIOUS

PDF

77.7 KB Created: 2021-03-17 02:05:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a1875857b8c4a9a50b46b5269f73c9a SHA-1: b71db9759d2981079d011567366974eb3f591af9 SHA-256: 5c9467d13c416d710dd0ae3c2f7b22470a8ed4af3ddd5b6224498a82ff8d3aaf
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, with the primary malicious URL being https://dafemum.ru/strik. The presence of numerous external links suggests an attempt to manipulate search engine results or redirect users to phishing sites. No scripts were extracted, but the PDF structure and link farm indicate a phishing or SEO spam attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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=fmea+5th+edition+release+date
    • https://cdn.sqhk.co/doparibi/vhhqfjc/jurassic_park_racer.pdf
    • https://static.s123-cdn-static.com/uploads/4368466/normal_5ffcb12f9c10c.pdf
    • https://cdn-cms.f-static.net/uploads/4422638/normal_5fd68df54298c.pdf
    • https://cdn-cms.f-static.net/uploads/4415326/normal_602f271e18c8f.pdf
    • https://cdn-cms.f-static.net/uploads/4468259/normal_5fd0bcc2e5c10.pdf
    • https://cdn-cms.f-static.net/uploads/4405185/normal_60226bfd4041e.pdf
    • https://cdn-cms.f-static.net/uploads/4471692/normal_602cd878608d3.pdf
    • https://static.s123-cdn-static.com/uploads/4484356/normal_6004174c358b7.pdf
    • https://cdn.sqhk.co/xaselavub/aiihbgd/29243330078.pdf
    • https://cdn-cms.f-static.net/uploads/4491436/normal_5fd2e8c0658d3.pdf
    • https://cdn-cms.f-static.net/uploads/4380857/normal_6037f144c785f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dc1f376a-bfed-4141-904a-cea09043c85a/cuanto_tiempo_se_tarda_un_cohete_en_llegar_a_la_luna.pdf
    • https://s3.amazonaws.com/jefazaxal/ring_of_fire_map_investigation_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/007ffedb-a16c-4548-932e-79448537e8d2/gasovose.pdf
    • https://s3.amazonaws.com/wokesabisevo/critical_thinking_questions_part_1_answers.pdf
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_309763df09bd456e9162ccca138aed8a.pdf?index=true
    • https://s3.amazonaws.com/wapabefizosumi/sazabafawiku.pdf
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_40a0c7a984fd4135b426fd4e738e0417.pdf?index=true
    • 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_off0000f450.bin
7e6ebe3e112836e2b432d72a5e39679be79669826e473adcc727547342f52ea6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF450 5144 bytes
font_01_sfnt_off000105a3.bin
fc43c93d996c205b8bd6eec66bde46062ea743a4aa040973f79b72be8119f972		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105A3 10672 bytes

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