Malicious PDF — malware analysis report

Static analysis result for SHA-256 6849b807f492234f…

MALICIOUS

PDF

76.5 KB Created: 2021-09-17 15:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fe8099fefd30dc73d5ba73dbeeaa4228 SHA-1: 659bbea8522082ee783cea0005642a55422c82f2 SHA-256: 6849b807f492234fcc1bdaab969882ba9fda01efbae7eaa9bb30cca97fd4ae7e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous URLs indicate a redirection to a link farm, likely intended to host phishing content or further malware. ClamAV also detected this as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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
  • 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://milkyway-vn.com/upload/files/pogetelagazejorawedutekap.pdf In PDF document text
    • http://softwarefactory.nl/images/file/44940223815.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/fizidibidimab.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/zopezusizapivetofelaba.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/11584510248.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/45342717360.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/30759708857.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/55912203748.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/40951118792.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/rimapoginano.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/fatokawalisuwam.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/23481463731.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/a9l6mdu39imatftpfb17akgf6f/lebapawa.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/81199387033.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/kebos.pdfIn PDF document text
    • http://momsystem.ru/public/file/gipabekuzosadabuzesi.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/55663408674.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/jawapakesexalikatono.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/pekobuw.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161321aeff2e39---toregifas.pdfIn PDF document text
    • https://ivanamihic.com/files/65059514697.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/gelimamupog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=block+network+access+android+appPDF 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_off0000c5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFA 10736 bytes
SHA-256: 2207c55050d128c33349170aa1e16e48d9300e233cb2fc2a625e7c213fdb5c43
font_02_sfnt_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 17556 bytes
SHA-256: 935906b727527bcc9858d419538febb5335681da872624345d6a6ad0e0318498

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