Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67e311d329d5ebd…

MALICIOUS

PDF

65.4 KB Created: 2020-12-23 23:54:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f952fe34245dfdd184d99f2a2caab90e SHA-1: 1b2f3c92d668c4fc8bc644374fb291181a419820 SHA-256: f67e311d329d5ebddfa12a214902bf48a18e08231e7ac0660079b8052c476772
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'link farm', suggesting a phishing or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://trafficel.ru/strik?utm_term=shooty+skies+secret+characters
    • https://cdn-cms.f-static.net/uploads/4404738/normal_5fa5a5001fdb1.pdf
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5f9326950c109.pdf
    • https://xexijezukivox.weebly.com/uploads/1/3/0/8/130874296/dasaboz_giseribepidat_zonopuwun.pdf
    • https://cdn-cms.f-static.net/uploads/4403143/normal_5fd34d2db75df.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/midizaxopazeji/rirezosirabekebugid.pdf
    • https://s3.amazonaws.com/vutame/council_tax_authorising_your_agent_form.pdf
    • https://s3.amazonaws.com/lulelepese/boat_propeller_design_software.pdf
    • https://s3.amazonaws.com/nafibanefexex/va_alive_and_well_statement_form.pdf
    • https://s3.amazonaws.com/lijopavexanuse/audio_file_from_google_drive.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_off0000c0bc.bin
1ff26e1ccca10b6479c1e23da12d3652dd075e196657b7dde358358d467a5cb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0BC 5124 bytes
font_01_sfnt_off0000d229.bin
7bb65e03b24d5deb11c4b5888ccfc54ae48f78b06849f31168c6b48bf7d2b517		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD229 11288 bytes

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