Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f076cb86b5c8d6…

MALICIOUS

PDF

82.2 KB Created: 2021-09-11 13:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c8865317c4a47dd80374a3eb0c303f17 SHA-1: 2349be96459ebc8aba862f9429e4792ca6426041 SHA-256: 99f076cb86b5c8d6c8fe721ab2d8f074e0a75b8c8e863f2e36a5cc3b16625682
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, often as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=series+x+sync+controller PDF link annotation
    • http://pincodehub.in/userfiles/file/wewowufixukovajefiji.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109060156494769.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/54431112079.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/jotufazatexezasotuboju.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/84350854583.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/rokugu.pdfIn PDF document text
    • http://theponghop.com/upload/files/nafafigelopepenaneguned.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/wapewotubaladawinixazu.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/73344974531.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/51016187242.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161315611ca42f---4770532345.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109060903051673.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/42689023166.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/14240414077.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/73766985019.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/38571742950.pdfIn PDF document text
    • http://na3.it/misc/file/dotagavufejusozowibigaxor.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/kozizupi.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/65712580931.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/6o4i2ltc2mj9v7d5dt1ipqpitl/97243041758.pdfIn PDF document text
    • http://mlight.cz/archiv/file/23924797849.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2109032128275585774iyc1f.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/topon.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/59083935265.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_off0000dc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC74 18176 bytes
SHA-256: f34515df4ed06cf0fe84e1f1ba7cd321e14ae27c9923790af84d95e34411dcb1
font_01_sfnt_off00010ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BF 10352 bytes
SHA-256: 99c602fbb7ed04cd2e445368f9dba9e2c9861f654a27befc576f4b35ac30c5bf