Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4793799a3f7c687…

MALICIOUS

PDF

79.9 KB Created: 2021-05-08 06:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6cff73fff1e7e233d230c8abe9437091 SHA-1: 20654f8a943c5bef0497b20df930147019ca89a4 SHA-256: c4793799a3f7c687114ae286a6ae2beaa7f3ab3141a525758ce17244a618d26b
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'the school donald barthelme postmodernism' to encourage clicks on the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://xezojetit.ru/strik?utm_term=the+school+donald+barthelme+postmodernism
    • https://cdn-cms.f-static.net/uploads/4500199/normal_605068cab74f5.pdf
    • https://cdn.sqhk.co/gederanew/gcPjikR/girlfriends_guide_to_divorce_episodes_season_1.pdf
    • https://cdn-cms.f-static.net/uploads/4386092/normal_6037148f9b6e0.pdf
    • https://static.s123-cdn-static.com/uploads/4456379/normal_5fe564ae68c1a.pdf
    • http://bogplaktnc.fun/the_one_thing_book_in_urdu49upy.pdf
    • https://cdn-cms.f-static.net/uploads/4403408/normal_5fd9e2f66a36e.pdf
    • https://cdn.sqhk.co/bovokolel/UCaY3ie/61613289805.pdf
    • https://static.s123-cdn-static.com/uploads/4466398/normal_60097b18a0967.pdf
    • https://cdn.sqhk.co/vuveleni/byjjfgg/whatsapp_sticker_maker_online_mac.pdf
    • https://cdn.sqhk.co/forinabam/aJNhggj/juxasafasolired.pdf
    • https://cdn-cms.f-static.net/uploads/4406455/normal_604d47827c091.pdf
    • http://brettlockhart.com/psycholinguistics_language_mind_and_worldsni8e.pdf
    • http://wisecredit.info/7296714040833lne.pdf
    • http://lomuwugevona.getenjoyment.net/87917966689.pdf
    • http://nozumupi.medianewsonline.com/class_10_maths_book_solution_download.pdf
    • http://repochka.site/magoxibon0amho.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mexefesu.epizy.com/77461065115.pdf
    • http://widevuwototavu.rf.gd/golezijewedegit.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_off0000fa8e.bin
f2ae958a8cf02a7f7755501ff88115efdb7eed0e333d8dff76790fae7d7c4964		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8E 5404 bytes
font_01_sfnt_off00010cb5.bin
e7c38f6e3b8059156ea5672bd0fec4c412b5fa2471fc8525f21bef6c58e65e1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB5 11520 bytes

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