Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d3e52e8bc6e349c…

MALICIOUS

PDF

84.4 KB Created: 2021-09-12 22:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ffb24dcc4f9accc92f44455ba6c0960d SHA-1: e8dacf900b829822fbdcd3463ef11063e82122b2 SHA-256: 0d3e52e8bc6e349c7ddaa66e0a6db53e97405be60dbfb2212a48bae3e0d4ac5e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to external sites, many of which are part of link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF_URI heuristic specifically highlights a URL likely used to deliver a payload or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/uplcv?utm_term=sigil+witchery+pdf+download PDF link annotation
    • http://regmac.net/userfiles/files/fedajopibobopezozavagel.pdfIn PDF document text
    • http://land89.com/ckupload/files/67352763651.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/lafovafikam.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/rugalaminawu.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/pogikusumovebaj.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/72549392048.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/pozolazawegodegiwena.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/17544193907.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/zajobavatidule.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/kedovilodusi.pdfIn PDF document text
    • https://biocoils.com/img/file/tidejuladowesewoketug.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/20654062852.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/zoketudufiko.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/nemerodudu.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/50705543817.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hhed3osv5up3rlat3a1jbpbutq/kotogigotubome.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/69220274509.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/86281622950.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210909_9065CD50F3DE041A.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9bec11223---40521085466.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/26766525303.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/72065936785.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/ravoxupasuf.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/welefixe.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/42063427488.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210906_5CCC34FB900B3BD1.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_off0000e58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58E 11004 bytes
SHA-256: 6f8ec5ef2ccc6d04422b23bf8411ceb208567221a8f9d72645a490ac5d06160f
font_01_sfnt_off0000feef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11701 17328 bytes
SHA-256: b5d4a36ba0aad976f7c83624e8bfb3912e511a78686e4775d6585104c39435e7