Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be8fdea72902b23…

MALICIOUS

PDF

70.3 KB Created: 2021-09-28 19:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1ad02cf594b3ac3f24f2c0542e5ae51c SHA-1: 4d2e21ab8791534499ed3e3ef93496ef62a59712 SHA-256: 7be8fdea72902b234f6c4a55b0010a28397d948805efa3ac1836106a6b7696cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, indicating it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this behavior, suggesting the document's purpose is to redirect users to potentially harmful content or phishing sites. The presence of multiple external URIs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://medvor.ru/uplcv?utm_term=vanessa+hudgens+2007+nude PDF link annotation
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/32bc481586c6d8183eadd3f3e9e869f4/rowafepi.pdfIn PDF document text
    • http://calisnt.com/uploads/files/malujegudezinot.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/35220248583.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109062026143989.pdfIn PDF document text
    • https://medius.sk/userfiles/file/91331297906.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161312aa97c8b6---zepuruzebenabitugibada.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/92c9fa0e7ca3349f2e30347752df13a1.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/92750849630.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/35212394154.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/wekojixegupatitolarawapu.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090410590273499.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/26204871078.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/goxakawos.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/57363972524.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/58692202496.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/vibamobimelasigezowusap.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/zokanupotuwutiwubezuleme.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/12682246757.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/28318062579.pdfIn PDF document text
    • http://allycatering.com/userfiles/penovasalek.pdfIn PDF document text
    • https://olterus.org/contents/files/89890098407.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///2021924820585472.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/tanelasagexilononobufav.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/95569787232.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/33094125101.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/1907592286.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_off0000b3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D5 15116 bytes
SHA-256: 4aca63546806174f2aefe48191c1b12aa0cf02c6d7c693bcd26271427afec876
font_01_sfnt_off0000d9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 10432 bytes
SHA-256: 53c832f0f5ae2e7b805f56c5eb4943ad76649529f3ab990bd6d6495bd4968899