Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d974eda9243c07…

MALICIOUS

PDF

76.7 KB Created: 2021-09-18 06:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d3167883d844c123c8371cd80ba481cf SHA-1: f1fb3aaf9adea7d481614100465ed147def40a3c SHA-256: e4d974eda9243c07958c221cef7a49967e1d98cc7ae54e920d76fd5232eb0fa8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs and is described as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://ketchas.ru/uplcv?utm_term=dragon+ball+dubbed PDF link annotation
    • https://hotellemaritime.com/hotel/upload/files/97054150285.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/87998798073.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/wegodunu.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/69647098563.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/lusowosalepatuwok.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/75067845993.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/17689172691.pdfIn PDF document text
    • https://faceless.me/userfiles/files/9561322296.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/fafebojatejowexodumowawep.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16133cf07b5ce0---26968626665.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210915_202359.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/4uidb38n5v6t24tqsr91ubp15k/vujiginunebinamewonumolu.pdfIn PDF document text
    • http://skncn.com/u/files/14441609556.pdfIn PDF document text
    • https://12shio3.com/contents/files/robaxotobosamomoteperiwof.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/52038424831.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/renuwubo.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/56400522893.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/bakukofagamu.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/lowakeletomo.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/zuvajama.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/40904053463.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/12279462862.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_off0000c137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94E 10304 bytes
SHA-256: 3bc9ffbdf8ef9250a5492338cc0c7500441894856cd3ecf1f0276e4da3f7ec45
font_02_sfnt_off0000f05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05F 20288 bytes
SHA-256: ee0428ed53f40b98810c5d46daac2a2ff5c91ce754bea4deaa4bd7f7ec1d3171

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