Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2ea45762c3b27a…

MALICIOUS

PDF

79.3 KB Created: 2021-09-09 09:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d770293ef57f6e9da3769a77b9e325dd SHA-1: 00dd0d94e56263da777095f243bd8cd1b482745d SHA-256: 3f2ea45762c3b27ad7438d451177cf01d4389dabb82fc35ac51881ec9d657cc0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, with one heuristic specifically identifying a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially malicious sites, aligning with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://hz-karavany.cz/ckfinder/userfiles/files/2676892733.pdf In PDF document text
    • http://seghers.kr/data/editor/file/107388737661349217afabe.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/wemovupozafifaxuteriguper.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/2671425933.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/gisitupuzuvomajisolape.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/notavajuruzixu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zoxibinepunulit.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/73033722625.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/56480294210.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/55698041899.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/nekiralulesagi.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210902142313.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/fajodabumepi.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/xutesabaf.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/86964818338.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/b32osk389hjfrta5tg6ua6r732/42044334902.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210906_1FC65938B23C53A1.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/68791858535.pdfIn PDF document text
    • http://haihengpharm.com/upload/files/nebogavifulefeme.pdfIn PDF document text
    • http://leruichem.com/upload/files/fakuradutonekusiva.pdfIn PDF document text
    • https://bachson.net/upload/file/22155230641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=jake+paul+vs+ben+askren+stream+freePDF 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_off0000cd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD87 19056 bytes
SHA-256: 4df929c780e1be6c9676b00e1dbf7888a80be03ea4ad9d56a1ade50e0789c9ca
font_01_sfnt_off0000fed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED7 10696 bytes
SHA-256: abfbb2ec826f622d0bd09be6975db11cbab0ba33957f6ef1205ccd6e68d9bece
font_02_sfnt_off00011740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1