Malicious PDF — malware analysis report

Static analysis result for SHA-256 17ff2ebb9b02cfa8…

MALICIOUS

PDF

72.0 KB Created: 2021-09-21 23:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cffea810329d088bbc0af0181391aed5 SHA-1: 4a8c37e4ce23d3db7905967fe76252c02e8101bb SHA-256: 17ff2ebb9b02cfa87ab48ce5320fae0fd3224538c540414c458d0221b33a7bfb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a trojan. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is structured to obscure its malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://communeouchamps.fr/userfiles/file/52194740796.pdf In PDF document text
    • https://guapa2.com/admin/fck/file/15410970157.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/61921004013.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/mizurolop.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/ratidevesediru.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/30992119673.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/tutigegutu.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/foboxu.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/10439484584.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/61596322224.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/17337667700.pdfIn PDF document text
    • http://jcpingie.be/public/files/poxofalesivonotafij.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/60177344883.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210915171326_ut4ah2.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/23177890328.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/zerivele.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/72288817501.pdfIn PDF document text
    • http://schokofontaene.de/idata/vuxedawademobapi.pdfIn PDF document text
    • http://screen.by/images/file/zuxoxetazajogaf.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161494fc0ea100---54230529527.pdfIn PDF document text
    • http://llux.vn/uploads/files/84377887872.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/61712400836.pdfIn PDF document text
    • http://ausafe.net/images/art/files/34937086935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=download+failed+because+you+may+not+have+purchased+this+app+gta+vice+cityPDF link annotation
    • 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_off0000b4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0D 11576 bytes
SHA-256: 8527a4d9aacff9ae7d3bdc6fa7cd0972eaa2127e2d7f67d3fac5239ee69d954b
font_02_sfnt_off0000e7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F3 16324 bytes
SHA-256: 42171b4c68a4d4eff905fa8d23ed9bf849a2e641e0923a74b28fd52af7c98b30

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