Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd36e13e67656328…

MALICIOUS

PDF

68.9 KB Created: 2020-11-13 15:32:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19d9255442820d95f2d66154bb6f771b SHA-1: e7fe18c3f09b78ec203bf76e562c1cb42375da38 SHA-256: fd36e13e67656328bb4ad3f8d7a98ae6c875f26ee88bf02ed5e5fa9acbf3be8c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains an embedded URI pointing to 'trafffi.ru', which is flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to contain metadata related to 'Rudin functional analysis errata' and the wkhtmltopdf tool, likely serving as a lure.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=rudin+functional+analysis+errata
    • https://novedoxax.weebly.com/uploads/1/3/4/5/134512377/zetewix.pdf
    • https://zomanuvid.weebly.com/uploads/1/3/4/4/134477829/muduturu-zasoxeboxewakej.pdf
    • https://cdn-cms.f-static.net/uploads/4417405/normal_5fabe96f8d853.pdf
    • https://megeleju.weebly.com/uploads/1/3/4/3/134319984/3ceee5390c0d.pdf
    • https://cdn-cms.f-static.net/uploads/4380088/normal_5f90fd5f6a648.pdf
    • https://kisupumusu.weebly.com/uploads/1/3/4/5/134513531/satadiwogifijalepaf.pdf
    • https://vabekozel.weebly.com/uploads/1/3/4/4/134487462/9556314.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/radubozufiwo/whitewing_defender_dehumidifier_parts.pdf
    • https://s3.amazonaws.com/wokesabisevo/nosokijorosesajojofegip.pdf
    • https://uploads.strikinglycdn.com/files/57c35222-5f53-435f-8425-336ce1d70fee/43062684080.pdf
    • https://uploads.strikinglycdn.com/files/34decef9-c5ba-485c-8252-2df9f8d56588/70867943081.pdf
    • https://uploads.strikinglycdn.com/files/8876ba61-ace9-4d8e-8e69-aa8db5303342/28452492908.pdf
    • https://uploads.strikinglycdn.com/files/47876f82-6000-4985-bffb-16ab59be2440/athlean_x_bodyweight_workout_routine.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_off0000cdf4.bin
e29c15319a8bb8a8ac4f0746937c46395c77f8a7c03d278f6cda771304ef6ce9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF4 5124 bytes
font_01_sfnt_off0000df7f.bin
61315d3634d0db360f9b6b59793d5d9eab68e3a9b7d28e58d6c384f497ec8814		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7F 11540 bytes

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