Malicious PDF — malware analysis report

Static analysis result for SHA-256 6320ed0a36453208…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 17:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b1c066e1d7e9912dd9ac6fc48495d86e SHA-1: 8982e86a750ea7ff31632827c8d21d5282ee9e75 SHA-256: 6320ed0a36453208db6dfdf4212fa0568427fc912c5af26235d908d0c3839601
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on disposable hosting. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection suggests it may be used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://henskeschildersbedrijf.nl/upload/51309448492.pdf In PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/goxepijafot.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/45297753620.pdfIn PDF document text
    • http://espicycooking.com/files/file///porulimutotoxokola.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/88333a9bf59e2dcdaa4059e68cea1482/28999606370.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/51543255832.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/b4bnj7q1dtm2ollsj6l2i8183a/vebizusasaxibu.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/34819563452.pdfIn PDF document text
    • http://nktrading.qa/file/files/83575140896.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/79594775148.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/lufujufo.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/236148376.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/71374985842.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/davapev.pdfIn PDF document text
    • http://ausafe.net/images/art/files/42387628820.pdfIn PDF document text
    • http://goldmustang.ru/files/files/telepalufelokizo.pdfIn PDF document text
    • http://wjcopy.com/upload/files/keledopidile.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/1408256696133e5250f1ba.pdfIn PDF document text
    • https://langumeistras.lt/i/File/98538554227.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/jiwewakutinojatolorap.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/saziduferofenon.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/tekotafuxuza.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/8062351478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ninja+warrior+legend+of+adventure+gamePDF 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_off0000d0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D9 10888 bytes
SHA-256: eb7b9437334d47b63555078b882a616f34064ecd677e852c9a54065a5480061d
font_01_sfnt_off0000e9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C8 18512 bytes
SHA-256: 6c84568b6c29c4a6de24ebf794478a6b0a0dced840ef1a9691c0e6e09c02982f
font_02_sfnt_off00011a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1