Malicious PDF — malware analysis report

Static analysis result for SHA-256 e145b9dbcce58caa…

MALICIOUS

PDF

87.9 KB Created: 2021-09-09 12:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 45595ba19c487cd1b7b4e11733facfeb SHA-1: f43d229aa28ee581a4e1de33ddf8deb60813b90c SHA-256: e145b9dbcce58caad55a4f9ba8aa59cfc8c34b1357eb94b55b6d133119d49b20
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drafthe.ru/uplcv?utm_term=how+to+transfer+phone+photos+to+computer PDF link annotation
    • https://tradingphrases.com/userfiles/files/39895654916.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/64434552229.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9d5407bec---gutotiroxomuxop.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/38344242665.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xozudolizexekupumaro.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/49821684186.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/beguxevokoza.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/72830627494.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/xodemevav.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/44342429761.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/74689989815.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0fdda07eb---9076957756.pdfIn PDF document text
    • https://pecsikult.hu/files/file/ribupugonotosap.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/99038871430.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/34262760853.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/46445533916.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/fizixiwajed.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/fumosapifegademunori.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/kosometidewizixif.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/91027006799.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/58006642085.pdfIn PDF document text
    • http://lovesenergy.nl/file/56641692857.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210905_191908.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/demozekugebikogi.pdfIn PDF document text
    • http://thaoduoconline.com/userfiles/image/file/muzofelamoxivizub.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_off0000f30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30D 18284 bytes
SHA-256: b2848dea8db33291e000e4770017e6038441d02bd74dce499140e45185839e02
font_01_sfnt_off00012181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13998 10784 bytes
SHA-256: c3bb12176abb04e90f8f303a31c62e8979bc9429b9306bac143294093f354685