Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d76592c58a6becd…

MALICIOUS

PDF

88.2 KB Created: 2021-09-13 17:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 53ea0d3b2737e46700b9e3148a815758 SHA-1: 1a342ea88f0e87e013cf3441245fd9437ab4056f SHA-256: 9d76592c58a6becdd8c0090bc3d2d04ad0718f73989aade2a566a4201beaff12
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicating a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of external URIs and the link farm heuristic point towards an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://infrive.ru/uplcv?utm_term=places+to+visit+in+minecraft PDF link annotation
    • http://ikra-ekb.ru/files/fckeditor/file/womufipupuz.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/nojujorazezuxatetozojor.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/ba4a44.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7c8207df0---6279601405.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/jabunijaxaluzidopanisob.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/72527190315.pdfIn PDF document text
    • http://theponghop.com/upload/files/piben.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/2662491885.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/10231578268.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/7099852509.pdfIn PDF document text
    • https://oferta.lt/i/File/44831259638.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/75966437175.pdfIn PDF document text
    • https://fond.ru/userfiles/file/77324964322.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/gilezul.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/3500325862.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/vutumagepinufoxak.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/85481172516.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/womomutofi.pdfIn PDF document text
    • http://myatkinsonfamily.com/userimages/tijamud.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/subenatepewuw.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/fipominisad.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/67865036560.pdfIn PDF document text
    • http://abc-tel.ru/data/File/moxuzal.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/f9faf727d79b6e263f803a89fb537b50/tevovi.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/zusediw.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/60608262798.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_off0000f46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7F 17956 bytes
SHA-256: 974ec7a4dfc5445b7f46ce0828faaf3f9ece05ad8767bd584461e90e2c3fa4de
font_02_sfnt_off00013b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B23 10564 bytes
SHA-256: 3e50690bd1f6b0512072763253d4c5bfb194e77e9a816d5ff7a191382a8a6e75