Malicious PDF — malware analysis report

Static analysis result for SHA-256 08c63a65adfbcc39…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 21:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2762a444476bfb4aea20fecfa06f120c SHA-1: af529fdb7085d7d55ccf0c1eae7858b85bf4e004 SHA-256: 08c63a65adfbcc3944d1601554877532e817dc408888930fab2b54f0f3e22b58
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded JavaScript, although not fully detailed, further supports the execution of malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=skyscape+android+crack PDF link annotation
    • http://yaqeen-eg.com/userfiles/file/15046286030.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/47352767647.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/59846065548.pdfIn PDF document text
    • http://fjsxsx558.com/upload/files/tupemeroza.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/50822959273.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/20289831521.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/67375998480.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/55789034733.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/rodivisu.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/75823722835.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109050505054883.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/85686643626.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/93e759bc3519db667cb39b71854ea621/bubinida.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/83305784689.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/5259185094.pdfIn PDF document text
    • http://japhina.com/upload/file/bodupol.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/92800415430.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613d828f15125---piwuvexabetokeru.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f9573382b---bevozezilizod.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/11011108117.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/jasuf.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_off0000d58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58E 10644 bytes
SHA-256: edc94faee9b935ad4ef01195d80ce883604a2c80e064ddcf35c5d13a962826a9
font_01_sfnt_off0000ee01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE01 17164 bytes
SHA-256: a6e8258979474137019513ae69af9f0b4c6223cddedd1808462dc02546578436
font_02_sfnt_off00011a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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