Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ab3763c053236a…

MALICIOUS

PDF

73.4 KB Created: 2021-09-08 16:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: da592cb89fd558f4010ce7b2f4822f94 SHA-1: d65a63ede727f72b19d72ef4073d9eb9489439a1 SHA-256: 11ab3763c053236a19969fc55e3867f9c78a68e591b24acf1fdfcaade29f129a
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for distributing further malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirms this behavior, indicating the PDF's primary purpose is to redirect users to potentially harmful sites. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6472

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 http://uni-farm.pl/ckfinder/userfiles/files/23746270971.pdf In PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/42001581211.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/kegiwomumunaduneponigan.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/33100622174.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/xatib.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/24051629502.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1630965575.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210905_7E44C0FBC3590519.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/zavopalaburetig.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/dafimudodeperitomejexad.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/95573740693.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/55065639172.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161387a7892515---vobozefuvi.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/sebojuxibipijob.pdfIn PDF document text
    • http://www.siposferenc.hu/html/1094520100.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/juragumutidekuvalokefex.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/logod.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/zilewu.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/24009382903.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16135b4a5d6c1b---10938436140.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/nawazafalegaramofive.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/mawonatibobamakovabelin.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/laxakupojolonufilo.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/31034010089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=a+whole+new+world+piano+music+pdfPDF 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_off0000e8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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