Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ed66a32986c8d5…

MALICIOUS

PDF

65.1 KB Created: 2021-02-23 22:46:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 9344f3e76b6e75b92f45c22b57fda21d SHA-1: 5909a6c529767bb6d0922273452c9ce894bb30f6 SHA-256: c0ed66a32986c8d5cbb8fdd14b8f51e2b485efb4cc0dd5cbca6a565db3c9a295
156 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of external links, identified as a PDF link farm. The primary URL points to a page about blocking calls, but the heuristic indicates a mass of other PDF links. This suggests a phishing or SEO manipulation tactic. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

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://druttle.ru/123?utm_term=how+to+block+calls+on+vtech PDF link annotation
    • https://kafememum.weebly.com/uploads/1/3/4/6/134616831/nizukileni-zureguwu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413457/normal_5fc5806e7e88f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372074/normal_600dc02d6d862.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454421/normal_5fcdf2a688b0a.pdfIn PDF document text
    • https://doruxajowivabog.weebly.com/uploads/1/3/4/8/134870444/5601205.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366015/normal_5fe332442bfcb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405904/normal_5fe395edecad1.pdfIn PDF document text
    • https://bojibelatos.weebly.com/uploads/1/3/4/0/134040608/1757587.pdfIn PDF document text
    • http://liginirudusupob.22web.org/pixez.pdfIn PDF document text
    • https://cdn.sqhk.co/dewozoju/jgjbT1v/teachers_salary_nyc_doe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450415/normal_5fd0d7faece17.pdfIn PDF document text
    • https://xebolefijepipol.weebly.com/uploads/1/3/0/7/130739937/tonukulosedajavuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470218/normal_60136083189e0.pdfIn PDF document text
    • https://dowamodugepaxa.weebly.com/uploads/1/3/0/7/130739159/dokusexodif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498983/normal_5fc7a564d3b10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58B 5108 bytes
SHA-256: 4fc65c646fdb3052040a3422ba8b936b4c60eeb3e5255ab94c95d606f339f2e2
font_01_sfnt_off0000d701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD701 9648 bytes
SHA-256: caa3b66327b9f75708f68f5c11fcdfb53e42a2d8eab6e2c42a0d5fd682fd58c0

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