Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3d958c90c9e05d…

MALICIOUS

PDF

65.8 KB Created: 2021-01-05 07:39:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 219f789147102e5329757b71e377eac7 SHA-1: 73a791a094e224f4f9d4b40fcb0530533a07a3a1 SHA-256: 0b3d958c90c9e05d238d27de7ee78932d37427b91bc23fe207eda4690659e51c
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for redirecting to known malicious infrastructure. It contains a large number of embedded links, many pointing to external PDF files, suggesting a link farm or redirection scheme. The ML classifier and ClamAV also strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://cctraff.ru/123?utm_term=bethpage+black+sign+for+sale
    • https://static.s123-cdn-static.com/uploads/4376852/normal_5fde1ac3524c7.pdf
    • https://jinobodusere.weebly.com/uploads/1/3/4/7/134722577/sitis.pdf
    • https://static.s123-cdn-static.com/uploads/4408464/normal_5fdef9ab7d93c.pdf
    • https://fugopezawisobib.weebly.com/uploads/1/3/1/3/131383650/tojelaka.pdf
    • https://munefetuwavebif.weebly.com/uploads/1/3/2/6/132683017/badebewejedowi.pdf
    • https://cdn-cms.f-static.net/uploads/4366627/normal_5fb3d6aa5974c.pdf
    • https://cdn-cms.f-static.net/uploads/4392463/normal_5fa8dcfb2dcb1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ffc503fb-354f-4c99-b204-d18fc5ba8f5b/kudisikatutipakurunemexe.pdf
    • https://s3.amazonaws.com/zozuxukoxo/gebefubafi.pdf
    • https://s3.amazonaws.com/jeduzizonox/32076094726.pdf
    • https://uploads.strikinglycdn.com/files/6fddd4b4-806c-4a18-aa69-b03b2df4622c/work_practice_problems_worksheet_1_answers.pdf
    • https://uploads.strikinglycdn.com/files/ef227e5d-b2d2-47b0-8c61-5cbbb2cfbc9b/vorikadotuginajumumonirom.pdf
    • https://s3.amazonaws.com/vesubodufisi/8188370419.pdf
    • https://s3.amazonaws.com/wonumafubij/android_9_vs_8.pdf
    • https://uploads.strikinglycdn.com/files/282a9291-9a3c-423a-bf7b-efa2b263ef1e/60957964614.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_off0000c63f.bin
a1d981316811438c1616d55d85421d5441aa753bd9cda9f2bdddb348bc21c4ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC63F 5528 bytes
font_01_sfnt_off0000d90a.bin
bb4c51c9b1387e5ceec0d12537df2331cab54a7d4a7a5c5569c8de05c1c47c00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD90A 9784 bytes

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