Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed33fcb4be736f6…

MALICIOUS

PDF

88.0 KB Created: 2021-09-12 14:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 50204f659f0a2bfffbb15efe53e88000 SHA-1: 9bb88a8dcf893e2374c055a64a4e7652659a123d SHA-256: 6ed33fcb4be736f6e8ad7c3c7eecc5a987731f1b15dea3bafa694c2403169a64
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://cs-web-design.de/ablage/userfiles/files/4088063948.pdf In PDF document text
    • http://keramann.ru/uploads/files/12858937131.pdfIn PDF document text
    • http://m2m2design.com/userfiles/27411826143.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/7250266965.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/163062402771067832024.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/mawenevosatukokolaken.pdfIn PDF document text
    • http://keacg.com/upload/files/9918666498.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136687ca15c7---1610135788.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/85202146070.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/guriweluna.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/likifaribavam.pdfIn PDF document text
    • http://infracsap.hu/files/file/rororiwiduvoluv.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/51079005020.pdfIn PDF document text
    • http://rnralpha.cz/res/file/doborukewugowo.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/vatineluxebaxuvawasabadi.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/juragaferuvuwakusokafetab.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/e2f15ca8575589d1caa142defc7a9551/48673195361.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/54700161268.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/ritakatetuxitizesex.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/logozasupozosunenerut.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/35905392211.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/13680181990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=can+you+see+who+stalks+you+on+instagramPDF 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_off0000f09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09D 10976 bytes
SHA-256: 8028e4243e593ee909919a9795dab8e7f6a9d165a51659c963eb6b3c0617e14b
font_01_sfnt_off00010a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001221a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221A 18648 bytes
SHA-256: 1a3728e621ee9123c285e8deaf59e902a2e08ba0de556441b4c39e13d5fbd576