Malicious PDF — malware analysis report

Static analysis result for SHA-256 253f6e9f15c2dea5…

MALICIOUS

PDF

80.1 KB Created: 2021-03-19 17:41:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2499386a879ff9d58a71db3eb78db35f SHA-1: ea2d61594f152c97db3c41ed9e975b47d91f2ced SHA-256: 253f6e9f15c2dea545471f76a6730824e7a43aa1700a111618f30b00195cf649
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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
  • 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://xezojetit.ru/123?utm_term=sports+logo+design+templates
    • http://dashcamtopbest.com/merax_vibration_machine_walmartf3tcp.pdf
    • http://cabinetshq.xyz/garmin_map_62s_reviewixoeb.pdf
    • https://cdn-cms.f-static.net/uploads/4462066/normal_6045089ae98fe.pdf
    • http://adanakebap.org/2920125501365q9c.pdf
    • https://cdn-cms.f-static.net/uploads/4369191/normal_604696ad891d2.pdf
    • https://cdn.sqhk.co/tajudozizif/ijiVAje/beat_the_buzzer_meaning.pdf
    • https://cdn.sqhk.co/jigotove/gfjaheC/curso_de_ingles_basico_gratis.pdf
    • https://cdn-cms.f-static.net/uploads/4386834/normal_603201ee93966.pdf
    • https://cdn-cms.f-static.net/uploads/4448976/normal_6022d775c14fc.pdf
    • https://static.s123-cdn-static.com/uploads/4411252/normal_5fe460a9368df.pdf
    • https://cdn.sqhk.co/nodebono/3uZidgf/timeline_template_google_docs.pdf
    • http://mazers.fun/what_does_12_grade_mean26hgo.pdf
    • https://static.s123-cdn-static.com/uploads/4369907/normal_5ff555aeebd93.pdf
    • https://cdn.sqhk.co/fimegasaz/ijgeWhc/game_backlog_spreadsheet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_bc5c43aae4bf439ea9a579b01f2c0d41.pdf?index=true
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_9f408fda0b79489b9dce68f05bab2149.pdf?index=true
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_c214a7071dc049adabdcc5db56856c93.pdf?index=true
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_f3e6b527e7014a6da2dc892a1babebb3.pdf?index=true
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_f44c481c02774496be4ccc9d0e098420.pdf?index=true
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_bc30131aef534c60bbf6bc9146d1c2a6.pdf?index=true
    • https://86146b48-cf95-488a-b5a0-22832f4589a6.filesusr.com/ugd/3b4eee_31e9eb495b0446188d7d28547ee6e8ac.pdf?index=true
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_dfea6fc4d6d545168060627254e56788.pdf?index=true
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_3f18f727954f4ebc95fbf9788ca988cf.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_off0000fb39.bin
3ef4ea1ab7b6b0557c6763aebead06c277a3f646db791201f8b92a82713b6174		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 5384 bytes
font_01_sfnt_off00010d64.bin
dd0b8e27faf42eef9e5974e374605af733ccfa3a582a78809e8067d071df4104		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D64 11044 bytes

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