Malicious PDF — malware analysis report

Static analysis result for SHA-256 59ead800ddcf5a6e…

MALICIOUS

PDF

84.7 KB Created: 2021-09-11 17:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 078aa8eb5188c472182ea52f414ff311 SHA-1: ad44f0546406322d8c2282ef7eab1c92fed5deda SHA-256: 59ead800ddcf5a6e73b15bcb9b79beb6e9e7a9460db12f30de5d24b6c71ab69d
166 Risk Score

Malware Insights

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

The sample is a PDF document that employs a social engineering tactic, specifically a browser extension installation lure, to trick users into compromising their systems. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to exploit user trust and potentially download further malicious content.

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://retrolondontees.com/userfiles/file/remutulimivumapiwivop.pdf In PDF document text
    • http://freewest.at/36741177651.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/39441510283.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/67917742715.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109021223121233.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/nunitiwetagi.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/2128067636.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/95818646764.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/67431484424.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/nomem.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8f3e8a472---bugafopizokegorifodenaza.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/53248613490.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/sipanemotepikusibotet.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/89215897326.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/15124639490.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/72613370595.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/pasubigetugodu.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613405b182c20---temajepobakowefaf.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/fadusowatewigigiwefatiwuz.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/falikamif.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/siwofalol.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/89090089508.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/xuguwibazinaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=android+crash+logs+locationPDF 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_off0000e4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D1 18500 bytes
SHA-256: 5bd9bdafc714473e6325f734ad80bf81ec1ef7dcc20d356373c48fa421e5d91a
font_01_sfnt_off00011592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA9 10496 bytes
SHA-256: e2dc872b9998ff5e1c57e3a39df3c0697d3f6248254e4e2d136a5271c5310d2d