Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7406bd98be109a…

MALICIOUS

PDF

80.3 KB Created: 2021-09-16 03:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ad2a6d00448ba7ffe0d78920a82727d9 SHA-1: 629889b54270ba79ab011c5a780cee39a5c2393d SHA-256: 4b7406bd98be109afced0d66c35f21bd1ca4be4eb09effab4b91f9f904c6ea62
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to deliver malicious content. The PDF structure and embedded URIs are indicative of a spearphishing attachment, aiming to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wastran.ru/uplcv?utm_term=android+auto+factory+reset PDF link annotation
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/gasazaga.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/95703849143.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/futefipevidezawejal.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/fakowudabanisedubura.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/jesogesinafenopow.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/ruvuvevoba.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/92131114497.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/43754915502.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/tupitutetisojelolido.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1ffea321f212ebed7dc69a4dd1c9d5f3/rarutuzanuvojudapeki.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/jiwubugoz.pdfIn PDF document text
    • https://parc-hotel.info/file/91867311620.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/vidurizadelopowuxe.pdfIn PDF document text
    • http://zaiger.ru/img/file/wiladukojetubivadaleno.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/tetifug.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/linebunigudobibag.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/samef.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/vujisoku.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/fapewolojalopebilu.pdfIn PDF document text
    • https://apluskleaning.com/admin/images/file/tiwotumugitufan.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135aee97d7d6---tododevifi.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/95847727571.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_off0000d39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB5 10620 bytes
SHA-256: ff2e7a704548196ce9135c4222aeff6dc9ffcd30167a87b973df2e331c417914
font_02_sfnt_off0001042c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042C 18440 bytes
SHA-256: 9daafdb9d899f6bf54d69fa0ed0424e5474be247e89291e5b8d67dbd53bfc603

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