Malicious PDF — malware analysis report

Static analysis result for SHA-256 d46aefab99043e50…

MALICIOUS

PDF

73.4 KB Created: 2021-09-25 08:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6b892f616ea97c93598418c693b62ab0 SHA-1: 3ef8b1b8b5599ccc767c5afd1c9bc426d0eb3840 SHA-256: d46aefab99043e506d04fe7ab366b610810e416858728f883d01776e190277c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://medvor.ru/uplcv?utm_term=gif+santa+claus+funny PDF link annotation
    • https://ducthai.vn/userfiles/file/lafawefila.pdfIn PDF document text
    • http://pjteam.hu/uploads/xivoneb.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/sigipadujez.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/xitudesaledok.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/xinavumedewofefivareva.pdfIn PDF document text
    • http://robedecreateur.com/img/files/13070551233.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/pelerexolunofutafofenuba.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/zasikenujafewopulisurud.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/37003247956.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/xuvuwedoxonep.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109151824067532.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/nowefewabagedadus.pdfIn PDF document text
    • http://amandamaitland.com/images/file/16476345407.pdfIn PDF document text
    • http://belniig.by/public/file/70974722536.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614568ae17d71---33411743211.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/94513895618.pdfIn PDF document text
    • https://mkontroll.hu/File/77052313663.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/16330220242.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/tawumepuruzuve.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f352a9e39---71638774799.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/luludegake.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/gegan.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/6237160603.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/goxamamuwukivabem.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/waxixonekiju.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/35362675628.pdfIn PDF document text
    • http://azizolace.cz/images/file/97781028943.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_off0000bae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE6 17460 bytes
SHA-256: f8046e821737179efb2735b5ddad0c03cc820cf4f51e1931fba8580a3d5b0e8e
font_01_sfnt_off0000e851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10068 10228 bytes
SHA-256: 555042bda1c1ba3f345d4516581f5299607c3cd0afbb4a6424ba5c59128ef1a2