Malicious PDF — malware analysis report

Static analysis result for SHA-256 043ae8617e2eabf0…

MALICIOUS

PDF

73.4 KB Created: 2021-10-06 18:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 16c530acdd37c3267bfec8049facebbb SHA-1: 82e85322265b7be440cf5b324705fc0b737fbcc3 SHA-256: 043ae8617e2eabf0a87aeebea1eabdc2ab42f1754eabe5096e5c4fb812f88d0e
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The PDF also includes a large number of external URIs, many of which point to potentially compromised or malicious domains, indicating a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7118

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://s8radziejowice-paszkow.pl/userfiles/file/puwuwejajixekavekako.pdf In PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/jekidomunipupoxes.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/69653118125.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/tisadiwujumube.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/33697328834.pdfIn PDF document text
    • https://cargotavio.ru/files/file/904397549.pdfIn PDF document text
    • http://merwepizza.com/upload/file/50732629324.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210928133048.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/97542633807.pdfIn PDF document text
    • https://podimercrm.com/img/files/laxezokodefetomul.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/wasizesutimun.pdfIn PDF document text
    • http://findusafranchise.com/files/files/97693751726.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/rotizuzukimagufokiluroral.pdfIn PDF document text
    • http://apvn.info/userfiles/file/3866794452.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021091118003380554.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/xefezezimudijape.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/58018715155.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/19562157443.pdfIn PDF document text
    • http://foxadv.net/file/zidirodekerelorafejox.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b1df513b9---8103646165.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/lovoxodidolewikonomof.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/8358738226.pdfIn PDF document text
    • https://sergiomauri.com/images/file/28555512143.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/77447885832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=sunflower+production+in+worldPDF 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_off00010dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC7 10544 bytes
SHA-256: 5153988ecdeeb1bfa80e92a68ed197c5174ba8407b26fbbcc90d3ab595aca808

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