Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b4f921ca8972a6…

MALICIOUS

PDF

84.0 KB Created: 2021-09-13 07:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ac5c52a6886acd2afe004e3eefe50d2a SHA-1: 1526ca633343f5c898f28a634b815eaff2d905c2 SHA-256: d2b4f921ca8972a6434654bdbe2282dca1b1102fae8f5bd0dee27d2b8e1af4f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://drafthe.ru/uplcv?utm_term=track+your+phone+android PDF link annotation
    • http://hotelniagararimini.eu/userfiles/files/14190907185.pdfIn PDF document text
    • http://charivne.info/images/file/64255397646.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/35906916353.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/mulufizupepefep.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/lulitivosukakomubixedese.pdfIn PDF document text
    • http://wamer.org/userfiles/file/44638240978.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/19302965021.pdfIn PDF document text
    • http://thevalleytrader.com/files/supoje.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/17901963417.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131001e1d9d5---pabegilizisak.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/5428118964.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161324ac07b43e---zavan.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/nifidizewo.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/firuriwetuwonujusutujot.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/bodeboluzaj.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/52322732108.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/dexor.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/995331085.pdfIn PDF document text
    • http://yljczl.com/uploadfile/20210910153838501.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/70417603579.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/nabufojevesegikeluwadaju.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/5037891875.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/rewuruvubisugumikeke.pdfIn PDF document text
    • http://kleiberit.ru/files/file/fatesoduketigivogo.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_off0000e322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 10568 bytes
SHA-256: 64a80df8221d9cfcc003950695e9fb94a5ee7183bdbd3c7f4b754039fcee76c0
font_02_sfnt_off00011341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11341 17916 bytes
SHA-256: 79026314138880b606fee3c53176b04c5e7d70ae60d4b59b7eb15f3c7eda4815

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