Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a133f48ab906d7…

MALICIOUS

PDF

74.6 KB Created: 2021-09-19 19:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 63b40b625cce82ced8642e08b5b58402 SHA-1: 4d4ea5dd7bec3e058272060454fa30d23189c5dc SHA-256: c9a133f48ab906d7e3832ee78132dee808cdcaa476f0c6f932612f62b5716fa3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous external domains, many of which are hosted on disposable infrastructure. While no scripts were directly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection or exploit delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://mixmarketing.vn/upload/fck/file/37093013205.pdf In PDF document text
    • https://taxforce.nl/userfiles/files/rupajivowozo.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/36099020007.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/50297055331.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/tawakefaralusabawelowateb.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109190728305026.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/zoretuwonawemudit.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/zemididesedaxekokimo.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/nuxajukasevikilonivopor.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/gorofutopiluzubidubebavoj.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b85a149cdd---77874433556.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/77391174854.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/10018853361.pdfIn PDF document text
    • http://poultech.net/d/files/62552907351.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/63537061445.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb25ed3139---17804967057.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/69699604418.pdfIn PDF document text
    • http://normel.org/files/upload/file/72229952502.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/35157059805.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/99070866269.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/1332071868.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/45464470180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=camera+permission+in+flutterPDF 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_off0000bf53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF53 17388 bytes
SHA-256: 66b573731b47a6f2a5a8a71403339dea19b4ed3c130628d5f1d60b102d25b369
font_01_sfnt_off0000ecad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C4 10652 bytes
SHA-256: fda0a4df7cc30e28f006be47a9ba2dc00e4907d331d75610e895dc14a0d05d25

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