Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41fe1f440911d50…

MALICIOUS

PDF

63.7 KB Created: 2021-09-16 20:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fda4cce6fcf120cc66d265909b17b49c SHA-1: 3f9732ec40b323ec009173cb784300ea9e06c7fa SHA-256: c41fe1f440911d502f0f57ddf07643d9daf319143634ee30074d7cbd0d81f6bb
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8257

Heuristics 4

  • 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
  • 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://balticstroy.com/uploads/files/runulofukimixigakaf.pdf In PDF document text
    • http://7sate.com/filespath/files/20210915203724.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/tikaragokokisivis.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/sawas.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/6114238726.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/lozonuduwaxituvovizokizip.pdfIn PDF document text
    • http://modern-pro.ru/files/file/xizerularizefogitel.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd52fb878c---18342356732.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/jutagenedepakugiliximo.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/funojagosobexepepaf.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/kuvorofixogoz.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/sojigamowotarejebeduluw.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/96821291583.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210909_065445.pdfIn PDF document text
    • http://icr34.fr/icr/icr34.fr/www/files/files/76756300119.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210904025459.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/jakugixujuvefuxujizuzav.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/87912092945.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/24055279852.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408bf27fd81---71663690863.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/jikekekuriwima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=jackie+chan+stuntmaster+apk+free+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B5 11152 bytes
SHA-256: 24f8008451decd256300fa004fa234b5324ae5f7c3c92882db967d15d3042189