Malicious PDF — malware analysis report

Static analysis result for SHA-256 07dd6ad0301a5824…

MALICIOUS

PDF

86.9 KB Created: 2021-09-19 08:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 52db6e3cef50c920c8f825e9fc5d6a58 SHA-1: ccb1ba4eb901a4dcf4eb86a526e6c7e8d54d6e96 SHA-256: 07dd6ad0301a582431678bca6de19379dfbc6e636fedb1ed239660a98c8588f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a large number of distinct hosts used for redirection. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic strongly suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pixomot.ru/uplcv?utm_term=how+to+take+screenshot+note+20 PDF link annotation
    • http://www.europesolidaire.eu/userfiles/files/viketosepedusamozobe.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/zowoxorodeteveropeni.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/juterabigezufuka.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/luxesemeniwofoni.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/vubesuxuxirof.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/wujat.pdfIn PDF document text
    • https://producto.works/userfiles/file/1136979403.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/46307589923.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/nagevefetepilanuluzelibi.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/11873895855.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/vijipazutifofowek.pdfIn PDF document text
    • http://merwepizza.com/upload/file/nolegewun.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630975570.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613d65bad41d8---rugobafol.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/74124408181.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/ca320119c178590a14bfe7553f3c62eb/tukuzipoxixumilogazojavu.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/c29a75fc5735edd8476994bfeb9f0e34/38555351937.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/wopogiwupunegizi.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/xegusitogupovibesevuvowa.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/kapixuzidulasupuwewiraf.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/52584807684.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/43235937357.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-4/20210904133857479931.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/92638301371.pdfIn PDF document text
    • https://music-group-store.com/upload/files/ledabowi.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/61395487287.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_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10659 10600 bytes
SHA-256: 92dac504aa134a3983bb31a9af7fa29f8707790f0d0141f12ece2d679044b0aa
font_02_sfnt_off00011ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA2 18296 bytes
SHA-256: 911d7ba3f2c9ab553f54da66534d9cd558d3fb9698964da1df01b18c7e5d2dc1