Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac6be4a2fd0aa4d…

MALICIOUS

PDF

75.5 KB Created: 2021-09-19 21:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 38324439ef5f19633e4379364bc76ff9 SHA-1: 1e8ccd53e990c048e38aa9026c1740ac1fae49e6 SHA-256: 0ac6be4a2fd0aa4de53107a35caff04a6234bca062f21b08ef954695eaabaf17
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://medvor.ru/uplcv?utm_term=the+autobiography+of+malcolm+x+free+pdf PDF link annotation
    • https://sergiomauri.com/images/file/65448636582.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/83067371043.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/92888893631.pdfIn PDF document text
    • http://keramann.ru/uploads/files/mexoxexufomurosazox.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e1655c0e5---12257427422.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/e5ea31c2ff83b2e90fffb0da318361ba/76402689804.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/5277078789.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/rozadazuvijijuresopakeku.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/82978924058.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/xojalomaderakagitiwiluwog.pdfIn PDF document text
    • http://cartopack.be/Images/file/59562280370.pdfIn PDF document text
    • https://mar3ol.com/Files/files/50741227311.pdfIn PDF document text
    • https://totounited.com/contents/files/wivafelapa.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/rigawesewub.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/17525973117.pdfIn PDF document text
    • http://dhf-china.com/d/files/zoxafemoserusaluwe.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/20646046955.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/fokolu.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/repuzaboxoxo.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/93212595849.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/21823611358.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/fopezoxigapanokugijim.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/92086049631.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/zakamen.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210901_E083EE07DEA44C83.pdfIn PDF document text
    • 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_off0000c1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA08 17140 bytes
SHA-256: 3e544b77c6e7f5331cfc9fbdf7b114efa4444589c5aec8240ff52346ee7bdf1b
font_02_sfnt_off0001063d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063D 11212 bytes
SHA-256: 0f40a79330db6aa08f43bafb2c4e7719245fb4423df9607cdc8bbcb7c137b454