Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49ec0a0e36da661…

MALICIOUS

PDF

97.2 KB Created: 2021-09-16 22:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c7b9b802f4b840daf0cddf3d535d1564 SHA-1: 29b2c56ce71d6b1f6ff1a404f2b0a2333cf220de SHA-256: b49ec0a0e36da661c25748dc59660e6653783dfc6a077fb6c5879ee945ee85c5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent is to trick users into revealing recovery secrets or private keys. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it acts as a lure to a phishing site or a download host for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://kuhomania.ru/ckfinder/userfiles/files/36302669230.pdf In PDF document text
    • https://danielstrehlau.com/userfiles/file/24043148205.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbefa8637b---wijifekafadizoxudi.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/21091412532937013020k78.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79387404540.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/75200086122.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/84270024557.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/forebisuba.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/80642079923.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/mutitejozukidoduwutuw.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/wikedalopimevu.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ed6ce835c1738f9a36d764f59c1c1305/sabofamatufox.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/60880068927.pdfIn PDF document text
    • https://securitydm.com/slicice/file/zusikisuseminege.pdfIn PDF document text
    • https://ms01bet.com/contents/files/bobus.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210907233855.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/texujejadakazutanax.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/79318975064.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/vibekudapanetedukob.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/57942909903.pdfIn PDF document text
    • http://trevorhannant.com/jutasumiborerufij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cordova+debug+android+emulatorPDF 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_off00011480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C97 10760 bytes
SHA-256: 255c30662580da234a43cd197c3030c7225ebaa4e8569eeb88f9b9474415495a
font_02_sfnt_off00014513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14513 18628 bytes
SHA-256: 8dfe3e53e8e52dcae4bed98067e1c8a5eaab85976178a3074d7238278194c3c7

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