Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ea46e0e149934d…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 19:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 30125c4e0fe90865849e0ba9471d738c SHA-1: 249fd8f13b99591bbb20ba6d967aae0fc485ec0c SHA-256: 41ea46e0e149934d666fec8e941a69fdeb0f47a47cb1d4893e1a4f4f56cdb6d0
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document employs a social engineering tactic, presenting a lure that prompts the user to install a browser extension or update. This is a common method for delivering malware or stealing credentials. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it may contain embedded JavaScript or exploit code designed to facilitate this lure, potentially leading to the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://2rent.gr/userfiles/file/50588384590.pdf In PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/vanipulozikipagogobumepal.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/sujaninaga.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210902044701096.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/renuzedakufenuzikuku.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/18534469418.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nigexesakozaxewotefolujo.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/rilimepimeseme.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/88227437707.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/kuzifopazavikepafiji.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376a170cdbd---96642529746.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/89195322073.pdfIn PDF document text
    • https://kapefashion.com/files/files/83737045694.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/lenilenoxekadu.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/mafuxulutaxororolobi.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/97955560621.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/52948118896.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/bixuxotabuxugara.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16315351189521.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/46985726453.pdfIn PDF document text
    • https://masukpt2.com/contents/files/vowedubobores.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/katedurefijajug.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/32296916407.pdfIn PDF document text
    • http://proxima-design.cz/files/file/88006694155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=bts+symbol+emoji+copy+and+pastePDF 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_off0000d85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85C 18200 bytes
SHA-256: e417f25220b83530e1028469fa6d384133d687b7177cd911cf8624e3801166c3
font_01_sfnt_off00010712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F29 11012 bytes
SHA-256: f678663599f6c816afc66ade7b3cbf16eaf8a2ff8bbe58f4b4e47af34d1a4610