Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceacbead223902ad…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 20:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2beed903800f7730329eb0e9e8ef08bc SHA-1: 1f88e3a245cb85a7d305a32e31bbdaa76705c56f SHA-256: ceacbead223902adbf1fb54b722bf6fee5537f7d262b725c79ad493d897b818d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a fake browser update or extension. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to lead the user to download and execute a malicious payload, potentially via a link to a secondary exploit or downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://daiichihr.com/uploads/news_file/45777973254.pdf In PDF document text
    • https://aprenda-atdi.com/uploads/files/76352285364.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/94717150143.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/5216765373.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/crk5ka6er4044dc8qbiirjq2fd/tibonuni.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/39403207594.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/6722165338.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/fuwimowovefosilin.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/58440320783.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/tadugopirusedu.pdfIn PDF document text
    • http://envigest.cz/upload/file/jupiwanujazigidawa.pdfIn PDF document text
    • http://ecole.ru/text/images/file/83298733378.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/widevinuruzepodefiwiweg.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/jodetuzubemuseji.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/70719790561.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/sogegapugajimiloxokog.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/makiwaxufiso.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161470b1c05350---24508826230.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/20372863438.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/22341691934.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/62014859676.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/79326944359.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/33722981314.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/wozuxutofejerububojuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+temporarily+block+a+website+on+chromePDF link annotation
    • 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_off0000d46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46D 11064 bytes
SHA-256: a60875633f7d2bf569e9e9c55b7a8caa848f8e7cf2a90843e8bc405f3e52a414
font_01_sfnt_off0000edca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 17996 bytes
SHA-256: 2c7a461032daa7da31bb0d7ba12095f326afb54ccbcf5193cfbae35526d4829d
font_02_sfnt_off00011c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1