Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed2cf351fe82764f…

MALICIOUS

PDF

96.3 KB Created: 2021-09-18 19:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 821a429d48eecb412df17621998e2373 SHA-1: 904eceb97c064dfee14dd7da47cf8b34dcd0281b SHA-256: ed2cf351fe82764fdc96db90a86ab40fca5976891e6ad1cc03aa574c94b4b8d8
134 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 structured as link farms, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=disaster+movie+full+movie+123 PDF link annotation
    • http://playbabydoll.com/userfiles/file/tegebemigil.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/91231735834.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/wadeb.pdfIn PDF document text
    • https://atavio.ru/files/file/66960934897.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/jadoro.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/27356887096.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/20325568315.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/11215816825.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/16132940673.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/20795195384.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/14853440960.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/d9628d785f710404c899ad6ffa47a498/37555292930.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/39308188098.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/99267069484.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/95967907763.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143fe73b7c77---rewolajuritefasoji.pdfIn PDF document text
    • http://bankerz.in/qpic/files/tolebujivebade.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/ravutupodu.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/43443201365.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/sidimikizufixa.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/zepilenejufuvesazenetuk.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/numolabi.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/15683278502.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/jafunorufat.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/23231847469.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/xanumi.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_off00010e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12638 10784 bytes
SHA-256: 70e1e6bcc06233ece070f170a310fece8c754d9d64522e905081ef0f1afc66e3
font_02_sfnt_off00013f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F40 19412 bytes
SHA-256: a5a2e0e1269f96dedf9ac3be55a93d548edd9bac7f455902d55d3df59697f3eb