Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1db070b061affc…

MALICIOUS

PDF

80.4 KB Created: 2021-09-24 08:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 35a65b621b36e8e41271ee953253d485 SHA-1: bd9b5b41d3521bd8b7630576bcc52909be2e3052 SHA-256: 6e1db070b061affc042c0e8d68ebb751dd1aaa0fbf509957687f836994102b59
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous disposable hosts, suggesting an attempt to distribute malicious content or phish for credentials. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://zeci.nl/im/image/17174133476.pdf In PDF document text
    • http://aloeverajuice.cz/files/file/90475879427.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/timaxojejogatuk.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/54093e87e6eab49742d3a1fdff8ed7cc/514183904.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/s2qr4lca5cr013vn94l85adevh/zugonifidad.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/84720761851.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/45562019062.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/lenopuzonasafopikijuv.pdfIn PDF document text
    • http://chinazzjx.com/d/files/17134542876.pdfIn PDF document text
    • http://cityfate.com/files/files/7332069205.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/46754863499.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/javewitoxujawu.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/lirotixa.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/tawovoju.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/95986179485.pdfIn PDF document text
    • http://cochemical.com/upload/files/74612102195.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/tuwelukiwapasi.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/lawexemikononupofadu.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/13896677746.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/zusesakewijubanujixu.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/74068032578.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/tukejirezepukekox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=cheat+plant+zombie+2PDF 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_off0000d7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 17348 bytes
SHA-256: 1a063f472f5a2a1f9a4a6eec14c2c0827daba99fbe9a81887dbf650d3769ff50
font_02_sfnt_off00011cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBC 10600 bytes
SHA-256: 4a3c9f18bec9e793f08d1d1d4dcb77298dce6278a48aa5f6cea0961d0a172c42

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