Malicious PDF — malware analysis report

Static analysis result for SHA-256 86cc191c55e00f2a…

MALICIOUS

PDF

78.3 KB Created: 2021-10-09 07:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 414026b3b92e6ed7d66ce950fc1170c0 SHA-1: d6ce0b11dfa59365d9963f840ae2432bb286900c SHA-256: 86cc191c55e00f2aff15a55a122c495353b4c25ab327ee49986549fa25a05f7b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although 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 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sanghvicranes.com/staging/media/venugisowimojalemava.pdf In PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/486015e2c66eb3763cff4d6768490ad8/75379656572.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/v9p3abpdts1nrg7apc3moatr86/zofafe.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/40723239623.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/boniwo.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/rafesosetuvarusoxu.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/38591350730.pdfIn PDF document text
    • https://almavilag.hu/files/files/21653073883.pdfIn PDF document text
    • http://dlzj.net/upload/files/2021092406250857816.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/wevagegutafemegugitosa.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/67881838135.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/16576635215.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/xoferam.pdfIn PDF document text
    • http://e-district.org/userfiles/file/38304879294.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/sixasibuvoxufoxoxelepe.pdfIn PDF document text
    • https://lsv-wittlage.de/ckfinder/userfiles/files/77518714791.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/94856782275.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/95065943532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=shadow+fight+2+freePDF 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_off0000cd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD32 10596 bytes
SHA-256: 4cb65a9f57d95363ba6c30ef11f45d534295d5d740389f8105f31c7b68f20cd7
font_01_sfnt_off0000e576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE576 17908 bytes
SHA-256: 4f3d0a9ddbaf30d69c68ba10830fa705ba4c3464964ab8e7caa32ca09441b82b
font_02_sfnt_off000113da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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