Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4ad81a1be19aa3…

MALICIOUS

PDF

78.3 KB Created: 2021-09-14 03:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 637e39cb024d6d373a1ce5694442ca88 SHA-1: fc6f89264bfe02b856784f934cfab19573e21546 SHA-256: 8e4ad81a1be19aa318a3dafb4cc4e0d451598d14526ff3cc96fa1df400ec49e0
214 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and PRC/3D content, which are often used to exploit vulnerabilities or deliver malicious payloads. The 'Browser extension / update installation lure' heuristic strongly suggests a social engineering tactic to trick the user into executing further malicious code. The presence of numerous external links, many pointing to PDF files on potentially disposable domains, indicates a link farm used for obfuscation or distributing further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • PRC/3D content in PDF high CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://kisikana.hr/UserFiles/files/gagaxiwitixomebozeb.pdf In PDF document text
    • http://music-summer-courses.eu/upload/files/gaxabekogidufojujebi.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/23570909952.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/sivukov.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/gabutufawu.pdfIn PDF document text
    • https://medtek.vn/storage/file/66114022822.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b69d70bd27---dudajetaloloboso.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/tumilovepuserunofajal.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/74229108837.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/kaxebizexita.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/nizodatoxa.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/vepupimefekovubonezi.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/90063929571.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/76486727439.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/dilitafamaveb.pdfIn PDF document text
    • http://js-space.de/userfiles/file/69473171191.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/xuwerew.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/21790772246.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/kupogidiminaji.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/71277562606.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/rojakod.pdfIn PDF document text
    • http://labonscafe.com/userfiles/fewotorifosi.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/49186927655.pdfIn PDF document text
    • https://alkoplast.rs/files/jowawakolexivewavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=unblock+vpn+browser+apkPDF 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_off0000ca69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA69 18704 bytes
SHA-256: de1d78aca150f793f0b2bf6fda9120e4d0bc4fc142de6c4e976ba696cc012e7a
font_01_sfnt_off0000fb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB37 10568 bytes
SHA-256: 4f65fca79b934a6148f2b3f2a0e21d2f6c6b0357401dd3f1c500b64121789a2a
font_02_sfnt_off00011355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.