Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d450ccc665a255d…

MALICIOUS

PDF

75.3 KB Created: 2021-09-18 17:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6ef59e53da06f997979dabeb4c077168 SHA-1: 57eee416eaea974a7a3d8fca7a7f6c17f1bd9019 SHA-256: 4d450ccc665a255dce4867eee8f5e1510e11b480dac542db7eb32becc6b2a1eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to external sites, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://elfast.ru/userfiles/file/xuzobutovajobuwiki.pdf In PDF document text
    • https://ibshospitals.com/userfiles/file/giweguvupavipevuf.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/55662378638.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/vufisuvutunapij.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/32553708798.pdfIn PDF document text
    • http://nanopena.cz/upload/file/29445308181.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/73491855899.pdfIn PDF document text
    • http://marketingnews.fr/images/file/10053525869.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210918183623.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/57809480619.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/23375278291.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/75795861658.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/11998716882.pdfIn PDF document text
    • http://surtek.biz/image/files/20150320_022809.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/xojel.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/kuker.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375caec9a10---73323841292.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/vukosuboboji.pdfIn PDF document text
    • https://rajaunited.com/contents/files/9215120226.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/11850266490.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/29657573906.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f87e9d71ba---vujijizawugefavu.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/72531760050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=download+toonpur+ka+superhero+full+moviePDF 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_off0000bdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBA 11108 bytes
SHA-256: a050a26d12fa38c188062ac736b6b637f90586888adbb39539bdaccb3009f804
font_01_sfnt_off0000d782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD782 18544 bytes
SHA-256: be35cae2877d150892c3821013b2c7648af37af0f055f7be8b1f139e1da9b9a7
font_02_sfnt_off000107e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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