Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c43d27713ed4976…

MALICIOUS

PDF

68.9 KB Created: 2021-09-21 09:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7e3cc7b46b368d30d0ac02b716af4cbb SHA-1: b4ba9ae09c5197c997d0fe1a6f34e80b6a722a97 SHA-256: 5c43d27713ed497600015a3ff6b13cfbf2ad96e42b3a55640ce21323ddf78047
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://essuances.com/ckfinder/userfiles/files/karine.pdf In PDF document text
    • https://gencshow.com/upload/ckfinder/files/16214879916.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/jikakasizovijalujet.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/15802877881.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/98238219865.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/vemif.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/kuliju.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/xarosaxab.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/ketikibuvevoxob.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/23256274713.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210901080107.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/41bd959b828edeeab7235d84788398f4/88930330731.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dusir.pdfIn PDF document text
    • https://wmu24.ru/media/file/fagurawavuzorikapasotetu.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/67325147633.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/fetavirozedomo.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/74037946475.pdfIn PDF document text
    • https://lazerom.pro/media/file/97803432919.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/55641178988.pdfIn PDF document text
    • http://donghotam.com/luutru/files/52283002546.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/ruparowekakifemazagonixu.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/3289321729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=halo+master+chief+collection+cheat+codesPDF link annotation
    • 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_off0000b069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB069 14632 bytes
SHA-256: 258d99fcd46e887fc4d02d124dab711d6e3ee9986d3ffa175ce686db58955e55
font_01_sfnt_off0000d510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED27 10732 bytes
SHA-256: c1ac7c65378737cb9f7543c83b9fced61a29e2111fd732f4f09ce3fa0494b0e6

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