Malicious PDF — malware analysis report

Static analysis result for SHA-256 75182600a4c925c8…

MALICIOUS

PDF

81.0 KB Created: 2021-09-10 19:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d8faf6d3edb81eec6547b57c6e71d3ee SHA-1: 83b2fa885eca6c8de3976ff9fce4220dba757958 SHA-256: 75182600a4c925c8b26c2b86d9f74c665aa3f0419ec9bdd8f3a87fc519cadd34
166 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'Browser extension / update installation lure' heuristic strongly suggests a social engineering attack aimed at tricking the user into downloading and executing further malware. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://zonwering-nederland.nl/ckfinder/userfiles/files/79614211581.pdf In PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/50491459323.pdfIn PDF document text
    • https://wildnaturetravel.com/File/nomutalujedoledupododofi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360969f1428---venawuwewidekadikapisapo.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/towonisituxokosipujato.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/70619702478.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/84042527015.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/jujomuwoxi.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/99964974564.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/xisedabadegerosex.pdfIn PDF document text
    • https://cubic.is/userfiles/file/fuxanovalusizare.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/67192445307.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/14111785063.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/tejejebupusawim.pdfIn PDF document text
    • https://avflash.nl/upload/files/25397430241.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/85197161268.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/zajibuzudagal.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5r0pvubhmnu2g999uloiv1ssc5/bobetuje.pdfIn PDF document text
    • https://geniodelweb.com/file/80184064393.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/4833523508.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/rosotasipelite.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/gesumodoko.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/duwifeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+block+unwanted+sites+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_off0000d7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 17320 bytes
SHA-256: 064e435655549427c0508887b128848d4da36cf9752d4cfdbac8a12b52054489
font_02_sfnt_off00011cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBF 11044 bytes
SHA-256: 15adf3889606f239949d5e72de870cdd4ae01d5d6eea7758a2e180a0cba5da96