Malicious PDF — malware analysis report

Static analysis result for SHA-256 dedb6f8aded5fdbd…

MALICIOUS

PDF

70.5 KB Created: 2021-09-24 19:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3c524ca52a2d96d21f1ce755779da68e SHA-1: 1c3ffbf8c0172bacd503fadc554abb1a541db2bd SHA-256: dedb6f8aded5fdbd064fa725ac674a84bd9e7af2b910511ac5dc1386f21230f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains or are part of a link farm, suggesting a phishing or redirection scheme. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://cructi.ru/uplcv?utm_term=sex+tv+apk PDF link annotation
    • http://engroupe.ca/aym_image/files/larebuxuvositogipux.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/lupijuzimazarejizuji.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/10334085326.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/vewitavesixudixeg.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/41503258258.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/43694796767.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/qtn84a1vrt58n0cvfc3ehe23s3/22826456592.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/kukogakotipuras.pdfIn PDF document text
    • http://myesen.life/userfiles/file/14380090969.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/xojenexane.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/62472915291.pdfIn PDF document text
    • http://cartopack.be/Images/file/wupizilekonipigiwunapu.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/nidiwovoneje.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/12017196030.pdfIn PDF document text
    • https://megashina24.ru/files/files/95962230108.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210917210432.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133057555233---91980448627.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/54304275492.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/disakuwazaresizavomuxes.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/18658207127.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_off0000aed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E8 9952 bytes
SHA-256: e5d1a432d93f58da7180358541cff8d4bde35e3d73ba06cb6d4cb65c3613a2b2
font_02_sfnt_off0000dd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD22 18152 bytes
SHA-256: df12652760d448e8127d56b8b5f8896170a76afde45790b257863fc3df58aeb4

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