Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d7c862847835e11…

MALICIOUS

PDF

76.7 KB Created: 2021-09-18 08:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f875e09e019c916435d0d95028b036f8 SHA-1: 28125dfa40608ee1ee95ea229e49ed18c8770fb8 SHA-256: 9d7c862847835e11f510e13ae0d4f87733d7480406105d1f7f1eec12fe71a1fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct domains, many of which host PDF files. While no scripts were directly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://atlaskvartir.ua/data/uploads/files/69942545949.pdf In PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/xokuxozamoxafexekabe.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/kupetasab.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/72274454295.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/67791115907.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/kibesapeludufomozixoj.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/83391895272.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/24377185311.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/bedovujafadoxojoses.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161456939a3db5---fokisegavuwodebejesof.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/puputiwuju.pdfIn PDF document text
    • http://synphabase.ch/upload/file/91544200073.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/fusibujoruxazupolino.pdfIn PDF document text
    • http://ruihuitax.com/files/file/nekuzojebebufibejeta.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614014f02eae6---3460259734.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/jukowirijajagigofijixe.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/99112800893.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/vuruledijamazodexevovene.pdfIn PDF document text
    • https://deverfgrossiercms.deindrukdemo.nl/upload/files/luwixiwidaviduserununaw.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/1401207929.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/gikotufare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=krishnayan+in+gujarati+pdfPDF 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_off0000c4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C7 18516 bytes
SHA-256: 6647b9b473729c46be0c9052dbf017874e34f10c87f8d15088bed8234dd55dc9
font_01_sfnt_off0000f4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD1 10812 bytes
SHA-256: 1037abac90ae7ddab76a4594cc591aedc7e28cd908efa1a5600665d3f9eb530d

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