Malicious PDF — malware analysis report

Static analysis result for SHA-256 76600a143c00e1fb…

MALICIOUS

PDF

58.4 KB Created: 2020-11-29 00:18:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3c84b51d5018edb8aac9223c8e423fc8 SHA-1: 1d783e7da9d6be368d39b0e0e1ee31403a00c378 SHA-256: 76600a143c00e1fb8483fda4e9601a1c8fc37a4eaa9d3f28389791a5cd55aee8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO spamming tactic. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=unblocked+driving+games PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f8703deb4429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f8d102627c26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386086/normal_5f934ad7620ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_5f86f409ad848.pdfIn PDF document text
    • https://mixidesurujof.weebly.com/uploads/1/3/4/9/134902607/4542576.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375518/normal_5faf5c5f5ca14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_5fb2576a1f930.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422659/normal_5f9af08fcf794.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403688/normal_5f9f9f5f619a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460680/normal_5fb2c76833c6b.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/jowutoneranemuk/knowing_myself_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/b._o._c_legacy.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/34859214555.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/zipiwaz.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_off0000aaed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAED 5512 bytes
SHA-256: d837eaa742fc6aee10e512838619382af583ead49de7d976b587bdff7d620e57
font_01_sfnt_off0000bd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD98 9252 bytes
SHA-256: 0409310928be86256565a66836adf9039cfeae9961e529912d430fa3b28f0767

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