Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf01ffc6a2066e0e…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 02:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13675e9c1165b3f86aa3296bac2034e8 SHA-1: 959a09ffc4f5c286c6e6bcfb2516fd423fd312ea SHA-256: cf01ffc6a2066e0eba3d9c4882c53c1938abe30fe76c1d43ae20fde3c3df2b3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an intent to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://cructi.ru/uplcv?utm_term=oet+2.0+materials+for+nurses+pdf
    • http://egitara.com/upfiles/files/mutelenof.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161486e4413d4e---53970069805.pdf
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/72760537964.pdf
    • http://aorganboys.handyfriendship.com/upload/files/fiwunadumivel.pdf
    • https://penzion-pod-rozhlednou.cz/img/file/21403754166.pdf
    • https://dom4m.by/userfiles/files/13080532254.pdf
    • https://ayurmitra.com/files/file/22296842103.pdf
    • http://wxmx.cn/upload/ckimg/files/202109160153316854.pdf
    • http://apsara.ru/userfiles/file/voxod.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161492e439de11---zaluramonukif.pdf
    • http://xindeshiye.com/uploadfile/file///2021091701071336.pdf
    • http://traslochimontalto.it/userfiles/files/36910274372.pdf
    • http://kooijobs.in/ckfinder/userfiles/files/mifemiseb.pdf
    • http://bftt.marketsearching.com/upload/files/runepovamabizuxe.pdf
    • http://viquadro.com/userfiles/files/41919464487.pdf
    • http://lpc2529.com/piceditor/file/wizuvopexufol.pdf
    • http://moriefrusca.com/userfiles/files/jenewefaduxe.pdf
    • http://bmfjhjk.friend-match.com/upload/files/60293520565.pdf
    • https://avukat.kocgrafik.net/upload/files/40507236541.pdf
    • http://kayapalinakliyat.com/file/vabomapajomotagepurutu.pdf
    • https://sistemagestiondpr.co/userfiles/file/pakimijojuvot.pdf
    • http://vswet.ru/f/dezibo.pdf
    • http://rockbond-aac.com/id-admin/fckImages/file/6144177372.pdf
    • http://kyanite.tv/userfiles/file/fuxetujulimez.pdf
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/wemenabuxasizovabebimewum.pdf
    • http://yoga-privates.com/yoga-privates/file/46140456108.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://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_off0000b405.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB405 16792 bytes
font_01_sfnt_off0000cc17.bin
325b83996ce625c184b5fa2c07422e468bfc3934fff1ec662fdcb3e84fc51686		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC17 14932 bytes
font_02_sfnt_off0000f1a6.bin
8ad0c1c00fc01248e3edbcf13f7edea886df74c792a8d2cc02e4c59f3161d60c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A6 11092 bytes

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