Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bb0d9ddaf5bf60…

MALICIOUS

PDF

58.9 KB Created: 2020-11-21 21:04:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c56bfabf61fb3110be54e63705e38154 SHA-1: 9f79a9c5f61b55ef8684a8f2a379222063b498e5 SHA-256: 91bb0d9ddaf5bf6021ab3a313dce2955b11a050ab8db83f225ebe26b080a8249
154 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, flagged as a 'PDF_SEO_LINK_FARM', suggesting a malicious intent to redirect users. The presence of an embedded URL and the ML classifier's high confidence score further support this. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or malicious content delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9367

Heuristics 4

  • 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
  • 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://traffking.ru/123?utm_term=thundertree+map+roll20
    • https://cdn-cms.f-static.net/uploads/4371025/normal_5f9a0ce3e8646.pdf
    • https://wedebiki.weebly.com/uploads/1/3/0/9/130969436/3279488.pdf
    • https://mufanebix.weebly.com/uploads/1/3/4/3/134349193/9765953.pdf
    • https://jefapijuwenumik.weebly.com/uploads/1/3/4/4/134435530/5a2ce41c898.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9a14a769-41b6-40d1-898c-c5f0eeff5134/guzuvoluboxomenitifodogit.pdf
    • https://s3.amazonaws.com/simujix/gateway_apartments_del_rio_tx.pdf
    • https://s3.amazonaws.com/sefepugolupalax/justice_league_unlimited_theme_sheet_music.pdf
    • https://s3.amazonaws.com/fewunadupop/indirect_cash_flow_template_excel.pdf
    • https://s3.amazonaws.com/jijumupade/pictograph_worksheets_for_grade_6.pdf
    • https://uploads.strikinglycdn.com/files/b12178b6-ef04-4a52-b4b9-6a616646e1cf/93586754826.pdf
    • https://s3.amazonaws.com/wumodukubaru/legavanenolavar.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c53c.bin
c6581baff6322c3815db7e954acc2d2a1ae30ee83068700bb62668c622973b7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC53C 5244 bytes

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