Malicious PDF — malware analysis report

Static analysis result for SHA-256 f423fa9a19799725…

MALICIOUS

PDF

81.6 KB Created: 2021-09-15 21:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c13dc162a4f32e63281bdf7819c065f SHA-1: c24b237d0092fad5f2def8fb14c914ac1aa758d3 SHA-256: f423fa9a1979972554e9a02141255d1e2cfd1421e92c43152027fa82cfd45cb5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm on disposable hosting. The PDF contains numerous embedded URLs, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and the presence of many external links strongly indicate a malicious intent to redirect users to potentially harmful sites.

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://synerhu.ru/uplcv?utm_term=how+to+transfer+data+from+android+to+iphone+through+pc PDF link annotation
    • http://school15-tyumen.ru/f/gikederelegikutus.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/leloveweb.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/66063967227.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/romenogonabarinazisuwobov.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///kefojixixokuk.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/vorolesuje.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210907001855.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/bozujeni.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/jegegejoro.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/34924659032.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/gekifitufefosasoginufovi.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/35786892649.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/98979810930.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/zifaxetifobiwofes.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/dapuzivamiluwamibuwome.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021091215183873499.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/a8492aec3a7f57daaa8ec64b85a263ad/28575733724.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/25189955096.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/58182479148.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/vabiditeputedigisekilepe.pdfIn PDF document text
    • http://someteme.com/archivos/_20210901230122.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/dumosovivepebakumojuxotof.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_off0000d8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B6 11200 bytes
SHA-256: ebe9a2c3d709798dc53244719bf4e958d729ebfbe56403fa67d57a21e8c3839c
font_01_sfnt_off0000f28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28B 17888 bytes
SHA-256: 58b937d0cc1709e17f415b78b64cc4d4ae80b6500e49341e71bb30a179b4995c
font_02_sfnt_off00012072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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