Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ece02ed6b747b5…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 15:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3dfae9dd109ba4328e086e77c3a83006 SHA-1: 60e15d046f58a143cc12ecee6faffbf4eeb5e962 SHA-256: a9ece02ed6b747b5b25b1f154eb7803eccdc8e223bd6534b527a0932e9628f7b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to disposable hosting, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://pixomot.ru/uplcv?utm_term=the+karma+suture+pdf PDF link annotation
    • http://www.ih-consultant.com/ckfinder/userfiles/files/wumenasub.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/9120855935.pdfIn PDF document text
    • http://grimastone.ru/files/mejigafizewesefazekuraza.pdfIn PDF document text
    • http://berbun.com/user_img/file/65124964601.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/29802877511.pdfIn PDF document text
    • http://oris-am.com/editor_up/biligegoxufopujakiza.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/937378970.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/fejiwudupawizufavetigix.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/xevozuvejosivesejajosi.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34134212624.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/zijonozoxinubuxofavov.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/guzixefasugatupibinimag.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/fetivat.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/wabezakibifadobegi.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/votirodova.pdfIn PDF document text
    • https://proxus.nl/file/74457696254.pdfIn PDF document text
    • http://becucci.it/userfiles/files/buvasewazaxub.pdfIn PDF document text
    • http://ergakiland.ru/files/files/48505145872.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/mibasodorisupogowazanosen.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/52181384406.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021091112114994.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/d33bb244a7fb53a81fab463850888d16/45980335713.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/gowovofimadetoj.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b31534a8---juzijedabaxorejuvenu.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/vubozuj.pdfIn PDF document text
    • https://baptistfriends.org/media/zimozobitefepejosusojo.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/viverelujajivejug.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_off0000d15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15F 19540 bytes
SHA-256: 200f9270efd95b6d9ebdbdd56250d4d7ed76526e542678bd7e74dddbc2906576
font_01_sfnt_off000104b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC7 10556 bytes
SHA-256: 124eac7e1d7ad15c52164a8614ed83c332d1699f8e5ce93a4c1a36c5e8236f17