Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e441495670c85b0…

MALICIOUS

PDF

75.3 KB Created: 2020-11-24 23:18:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 529a86c9227427ccf996f4c79d055278 SHA-1: 552b0d18a501d9b0afe24dd5783c3af042b3bd6c SHA-256: 6e441495670c85b03da83f4555466ca3326d4581f8beb8d6a8cf087c2db1faf3
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to a domain associated with SEO spam, suggesting a phishing or malicious redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards an attempt to drive traffic to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/123?utm_term=ca+dao+t%25E1%25BB%25A5c+ng%25E1%25BB%25AF+vi%25E1%25BB%2587t+nam+ch%25E1%25BA%25BF
    • https://sasozepawises.weebly.com/uploads/1/3/4/3/134315695/7186806.pdf
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/fokigaka_lilopez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2b4f9b1e-13a5-4de3-9832-ed8d72d293d1/64516617956.pdf
    • https://uploads.strikinglycdn.com/files/52da6c1d-0a4f-4fac-84ca-c86ad2d019ac/the_body_coach_90_day_sss_plan_free.pdf
    • https://uploads.strikinglycdn.com/files/5d6c4f60-f99d-4003-8193-2df9bb83c223/jixiwizezijewudupa.pdf
    • https://uploads.strikinglycdn.com/files/c22c7381-491e-47d2-b17d-775acafba741/49276391880.pdf
    • https://uploads.strikinglycdn.com/files/d81bdaa3-9f33-4b28-bff2-dd06368175c5/51697585116.pdf
    • https://uploads.strikinglycdn.com/files/176a42d1-6e75-4de5-8d8b-ce251575d1ac/zugunamevevusas.pdf
    • https://uploads.strikinglycdn.com/files/dd28debd-c313-464d-956b-782abb68860c/vsam_scenario_based_interview_questions.pdf
    • https://uploads.strikinglycdn.com/files/5fd56514-dcbc-4f52-8135-34249523aab6/97224359330.pdf
    • https://uploads.strikinglycdn.com/files/f0dded14-7add-4e20-b69a-26d0515a037b/free_young_family_nudist.pdf
    • https://uploads.strikinglycdn.com/files/c40d633e-98b0-402e-b354-81eb78b4e311/31023623770.pdf
    • https://uploads.strikinglycdn.com/files/fdd2cc1b-ca73-42de-b1d2-b9d7bc840042/poruwilikaki.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_off0000dbc9.bin
75aeed42820a52fd6654ef6ad0cd4218b0cc254bfaee9960846e8bf00595d994		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC9 5700 bytes
font_01_sfnt_off0000ee2d.bin
eb7eed63590f75551853b0f399619d7aa8eda47e4c2b4735b994dadeef93774c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2D 22688 bytes

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