Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7244a46a48e94f…

MALICIOUS

PDF

82.3 KB Created: 2021-09-13 19:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3eee990169240a8643c791ebfe0b4fa2 SHA-1: 7db7b3251fa70c54956383575b81a08858f38fb5 SHA-256: ab7244a46a48e94fb11659c353537afffb2e27e018f6de570d91a050b78f8dd4
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to download and execute further malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing a malicious browser extension or update. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=wr3d+download+2k20 PDF link annotation
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/pusogeduni.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/87622050620.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd2ec9ba08---xarelekagipudozu.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/15576609592.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad1e7c9c3a---32194820847.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/76577545458.pdfIn PDF document text
    • https://tomas-music.com/contents/files/bosimeva.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/baxabobupofibenexezoteveg.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/11213003656135faa26b994.pdfIn PDF document text
    • http://raczcsalad.hu/files/47178177896.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/61568646279.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/sewasugofizawidivu.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/16128396217.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/masixa.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/35626822422.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/vozosukixitulib.pdfIn PDF document text
    • https://tsegypt.com/file/64031762500.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/virozewegosaloxanemize.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/40511151861.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/92206279812.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/ligikerowuxal.pdfIn PDF document text
    • http://coumert.com/images/file/86983584341.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/71390181080.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_off0000df08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF08 10336 bytes
SHA-256: 6facddd292f41b98c5283955fe788785ccd51eba72b00b31142b892454cd3802
font_01_sfnt_off0000f68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9F 17424 bytes
SHA-256: df22bf94ef1aa03eb3b345ea2821cc744510b2602a9d177475eba13dac9b6164