Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3da52d995445f0…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 22:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 707c1285940a1327b2a99542486a0a40 SHA-1: 43b342f4518a1c77124a46b40da4b3d64ea43a3c SHA-256: ba3da52d995445f045b3114be6b8f99f34628d992f3db371124195ceb20b7387
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oniceh.ru/uplcv?utm_term=alert+ios+react+native PDF link annotation
    • http://mybyblos.com/userfiles/file/lerelelojis.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/15746284884.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/34803094328.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/30196972575.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/jitogagidibotuw.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/zominepujoxa.pdfIn PDF document text
    • http://aid-calais.com/userfiles/file/fotosul.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/vevuroverugivuxo.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/aac58fbe68ed0bcf37f1b6beab2a717b/jupariwuzupibonezajum.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/23647707369.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/pedipifadexuko.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b229172af5---71111523432.pdfIn PDF document text
    • http://cutskytools.com/d/files/dalozakidumef.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/lagotuf.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/kesefumepete.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/2517183353.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/17233278596.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/25146975676.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210915_70731759CEFA76A8.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/wotip.pdfIn PDF document text
    • http://master-vin.ru/files/file/680113187.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB95 17884 bytes
SHA-256: 7ac7de1c10cf8cf4d0444f6695f3099524b4348f90e4895c611271d40ef861cc
font_02_sfnt_off00011aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFF 10272 bytes
SHA-256: 2bb85a0bf00969694c81a4bbae3d722315bf0cd177c0b800bb668767e8b8aa34

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