Malicious PDF — malware analysis report

Static analysis result for SHA-256 888a6ca4d7d49973…

MALICIOUS

PDF

44.2 KB Created: 2021-09-30 13:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3aa6f081656a3e8fa5dc680ca13ae458 SHA-1: bf80a3d2f5cb73ab532cd53b6c18cb11e7b29fb1 SHA-256: 888a6ca4d7d499732d309b9c32e47f213cff04a14fecf58b87936190900a9934
72 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The ML classifier also flagged this PDF as malicious. The embedded JavaScript likely redirects the user to one of the numerous external URLs found in the document, potentially for phishing or to download a second-stage payload. The presence of many disposable links and the use of wkhtmltopdf suggest a campaign focused on distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7351

Heuristics 4

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://sfinance.mn/userfiles/files/81590795791.pdf In PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/0f793675477afa4fb9f373d2456d2a80/75471294760.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/59481913835.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/15807718747.pdfIn PDF document text
    • https://sadex.pl/fck/file/womuxokudazepotefezobeve.pdfIn PDF document text
    • https://unosms.us/userfiles/file/29452292996.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/72539083073.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/68059825187.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/bipegazinuzupujib.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/jaresixido.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/rulamunopadosivivifeteg.pdfIn PDF document text
    • https://samowar.me/upload/file/49530541178.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/jidejotitarebef.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/gevavuwapele.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614d6f8653d6e---joridosopani.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/vilup.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/79242212706.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/10266568927.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/wabexipumekofilaxakexu.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/dawabuzesuxupirewo.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/takifufabo.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/zudomotajawalawejig.pdfIn PDF document text
    • https://rubfila.in/files/file/70568397361.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/80237255942.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/48053354970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=truck+simulator+apk+obbPDF link annotation