Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed50207c7f54eb7c…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 01:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87a3b62e3e63c0f717f22046b1cb87eb SHA-1: 97cdc25ae72a9573cbf4146e12323a09d202cc87 SHA-256: ed50207c7f54eb7cb9ebb9fcf127ecce106880390621e41c0a2d9934b278777b
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing and malware delivery attempt. The embedded JavaScript and external URIs, including one pointing to a raw IP address, suggest an attempt to download and execute further payloads or redirect the user to malicious sites. The 'Browser extension / update installation lure' heuristic indicates a social engineering tactic to trick users into compromising their systems.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 8

  • 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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://huntic.ru/uplcv?utm_term=how+to+update+chrome+on+phone PDF link annotation
    • http://irina-beha.com/ckfinder/userfiles/files/vegenawofojojitu.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/69835336419.pdfIn PDF document text
    • http://livestocktool.com/d/files/wudenukesup.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/gokeputugopixesewasujorev.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b2b1219da---wuwemekowofogiwuf.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/dovubugedowezikutov.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/20537569751.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/netojopitakuwuve.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/52422267826.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/zovifewo.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2a8e1584d---bolemezizujazijikavuwipul.pdfPDF link annotation
    • http://epicridesnepal.com/files/25782008393.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_off0000e4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A9 17156 bytes
SHA-256: 7887d4fbfaef6d12709aa23a912c2d47b647fe91e50f4e31436c27a8f734accc
font_01_sfnt_off00011179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11179 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12990 10652 bytes
SHA-256: b5f9d1d245a8511468454dc3b7d32016b2b0fd78cf048ddb11f1e3d298ffcfee

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