Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1f9e058738b81f…

MALICIOUS

PDF

73.3 KB Created: 2021-09-10 10:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6fc2ac69f690638740b93a65e80c5380 SHA-1: 1e8e518b28b8251ead663c20af5f378ef29b787c SHA-256: 9c1f9e058738b81f95e5c36ea64046d8f91d9d01500a8c03e366301465ad85da
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of distinct hosts and links, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent, likely to redirect users to potentially harmful content or further phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 4

  • 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://rosesrealtyhomes.com/userfiles/files/sufeturajoromedinupejapo.pdf In PDF document text
    • http://uniradioweb.info/userfiles/file/manotunijanijilujawutizes.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/zalivovaris.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/sovata.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/99976736792.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/71828804866.pdfIn PDF document text
    • http://sofar-france.com/userfiles/file/11054083187.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/27852159567.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///24832385279.pdfIn PDF document text
    • http://labotinnghia.com/img/files/visubuwulevefufebekor.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/ditosozafugorapigoxozubog.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332ac50f199---vurofoxejekusuvalidi.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/gegimujiwulakij.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/vavegixuzepinufesevu.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/19757995600.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/34502404564.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/vuvugozumopifiponox.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/10870462317.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/nasowijibolof.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/37678874963.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/20788916779.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/13605273960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=center+stage+turn+it+up+full+movie+123moviesPDF 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_off0000bac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC2 16408 bytes
SHA-256: e7e2e318efb88cc94f628984f402a565c7c9573daec38af327ec159a67ee7a42
font_01_sfnt_off0000e4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD08 11240 bytes
SHA-256: bf104d6bfbf39b1aaa6efcf63fc9796d46f652db068659473d58a70f5d496d0f

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