Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2964066c7cb9487…

MALICIOUS

PDF

76.8 KB Created: 2021-09-08 18:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3612c279de486c64caea34fe647e92a5 SHA-1: 46495cce3197ba1cf9cc1dedc1c720a1c78d881d SHA-256: a2964066c7cb948790b0df1337e035a22201d4c578e043cf6a52bc594688b63e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high number of distinct hosts and a low number of links per host, suggesting a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://leebyunghun.org/new/upload/board/files/xeludikop.pdf
    • http://mtjjt.com/2013/upload/article/files/210904032133049678usv65.pdf
    • https://watertorens.nl/userfiles/file/xivavujegivukipivu.pdf
    • https://astefin.ro/ckfinder/userfiles/files/wazepinajavekorar.pdf
    • http://upakuika.com/img/file/lopujofosavusuku.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613356c30b8ed---48168173063.pdf
    • http://actybrain-consult.com/Upload/files/seraxadiwizumaveziwe.pdf
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/kezero.pdf
    • https://ochronaskory.pl/pliki_user/File/lojisepeseju.pdf
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/78186130452.pdf
    • http://kbo.pl/ckfinder/userfiles/files/josafesaguruwopujofemaded.pdf
    • http://tiyuchangdi.com/upload_files/files/20210903_115721.pdf
    • http://zeminyerkaplama.com/upload/ckfinder/files/3221883700.pdf
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/kesoxilibinad.pdf
    • https://comtraining.cl/userfiles/files/57254031576.pdf
    • http://audyt.rowerowaszkola.pl/imgturysta/files/bugetegejokigona.pdf
    • http://bensonlandscape.com/editorData/file/xuwuferoraxuxosafixif.pdf
    • http://keralatravelpath.com/uploads/file/41793718300.pdf
    • http://www.fuchingrading.com/upload/file/34177776100.pdf
    • https://horgaszvelem.hu/ckfinder/userfiles/files/44043583475.pdf
    • https://kattliv.com/kattliv/admin/userfiles/file/kufosikovu.pdf
    • http://skupka54.ru/upload/m/xobufediboguwulezeg.pdf
    • https://xyoaa.org/sites/default/files/files/nagagej.pdf
    • https://girilawfirm.com/content_files/files/padosedoso.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=roborock+s50+manual+cz
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf39.bin
cfe03c46b6000bb979ae1f2fba2f31e311c9aa6e16936bc67893dfbb1f78ce44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF39 10760 bytes
font_01_sfnt_off0000d806.bin
f3dca26202dbca768ce03627c5537bbafc7514ea9dc2ce462bc13f8569b1d35f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD806 20592 bytes
font_02_sfnt_off00010e19.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E19 16792 bytes

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