Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe1d6d3aa4ec3ef5…

MALICIOUS

PDF

78.6 KB Created: 2021-01-10 06:54:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 0d691de014a13dd00f1608c06b71e5f9 SHA-1: 207ff3d90d8bced1b9aad41ff5084c0993b9a4a7 SHA-256: fe1d6d3aa4ec3ef5f4fe121b99a1900ae742a168622fb7d2fd2bb4f30192f4ad
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing campaign. ClamAV detection and ML classification further confirm its malicious nature. While no scripts were explicitly extracted, the presence of external links and the overall structure point towards a malicious document, likely delivered as a spearphishing attachment.

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 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.
  • 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://trafffi.ru/123?utm_term=historic+flight+foundation+gala PDF link annotation
    • https://cdn.sqhk.co/zunesunatiri/Fjijb2U/guerra_dei_titani_film.pdfIn PDF document text
    • https://firizuvamo.weebly.com/uploads/1/3/4/6/134618899/66f3133b1f.pdfIn PDF document text
    • https://zevejekigo.weebly.com/uploads/1/3/4/3/134374512/17adaa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424026/normal_5fbf3a70de61b.pdfIn PDF document text
    • https://zetakopazo.weebly.com/uploads/1/3/5/3/135351561/edf9ae9998.pdfIn PDF document text
    • https://site-1166044.mozfiles.com/files/1166044/chase_mobile_app_zelle.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415769/normal_5fdb379e7ec45.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/65811950401.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/65073005409.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/fetal_heart_monitoring_in_labour_nice_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/musokejixami/eta_full_form_in_software_development.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/sopaluvezavadafenuko.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/33270751898.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_off0000f3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3ED 5244 bytes
SHA-256: 36a9f88c01b34a20b5400b62b77138caf4db1dbe7136018f19a43f50b012a878
font_01_sfnt_off000105b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B7 11704 bytes
SHA-256: c784638edb1843d2260733d1126ee68d49519b2bb953ae2b7e93e0fd1af76c39

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