Malicious PDF — malware analysis report

Static analysis result for SHA-256 1338e59608dd8b10…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 08:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 84a7a4d6eda7be92d1c706bfa598275e SHA-1: 8b539a56cc0a404e7c6333a9e4f35da0ae7eece7 SHA-256: 1338e59608dd8b108b473379622bbc8cdb1afc09e28545fbe3be1a711994626c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm designed to obscure the true destination. While no scripts were explicitly extracted, the presence of numerous embedded URLs pointing to potentially malicious or unknown domains supports the conclusion that this document is used to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://work4shop.cz/userfiles/file/xogubatot.pdf In PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/44872368323.pdfIn PDF document text
    • http://newo.ru/files/files/64562102701.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0c5ee20b9---vonanujenuxivutuvow.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/12285378078.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/tubakezodaf.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/21156704504.pdfIn PDF document text
    • http://penzion.sarmo.cz/Images/file/44521775955.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/21958271476.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/17507701830.pdfIn PDF document text
    • https://emmaushuis.org/pages/gerilefewajavenilube.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/miwakasigazot.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/lirumojozura.pdfIn PDF document text
    • http://slsnn.ru/content/files/kipefed.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/21932666009.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/42781208158.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/93227069521.pdfIn PDF document text
    • https://anfauglir.com/images/file/ganagamoga.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16140ed7c400e5---35536737541.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/90987488646.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/xomilifafazudegavo.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/luxusumerow.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/lobixodakov.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/78345220197.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/28768398389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=transformers+legends+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_off0000d8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BA 18164 bytes
SHA-256: 516673800b6158f459f964f5bd6657b41079b8968fa5adfd80adf3cb14c49b02
font_01_sfnt_off000107c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDC 10708 bytes
SHA-256: a6381a41c689b7f65cef6aa7aaa04b723907cefa30509c76950ee7ce685416eb