Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b8cbd3239ebf2d…

MALICIOUS

PDF

77.5 KB Created: 2021-03-14 17:45:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8c828b22991407af4096825e2f73a9f0 SHA-1: 356c99f45ff73046ab904db92e7f96c5f9a66b7f SHA-256: f2b8cbd3239ebf2d1dc7c6562f6ef99a3e751eb8e224e5f18f370c85041367cf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external links indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9354

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://maypoin.ru/award?keyword=bartlett+s+quotations+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390366/normal_5fe60e7f0ac40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479462/normal_5fd6985f67f20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413973/normal_60297f95436aa.pdfIn PDF document text
    • http://rotawafuwuno.scienceontheweb.net/66208887162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386597/normal_604cc5676cc7b.pdfIn PDF document text
    • http://fukuzowi.sportsontheweb.net/vazurowurivupuborumiti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451208/normal_601e7e2e1c147.pdfIn PDF document text
    • http://kevifiregerufug.scienceontheweb.net/voulez_vous_danser_grand_mre.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373782/normal_602216a01a66a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483864/normal_5fdea64c4f6d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408596/normal_6023d2d886510.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369645/normal_5fd03928e5cd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379855/normal_6029a34162edf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392664/normal_604bc04871553.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kewevagisugimuw.onlinewebshop.net/adjetivos_posesivos_en_ingles_ejemplos.pdfIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_93535cddf8454febb48de2c75e2bd011.pdf?index=trueIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_04820fa9ba5c4ce484d958b5f5532ed7.pdf?index=trueIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_b0305ab6f5014bd9ad2195dda486c8cc.pdf?index=trueIn PDF document text
    • https://b962c29b-1a16-4d97-a630-68bfda4e66eb.filesusr.com/ugd/3e0cb9_eaf62b4902004856aa53785eda2b663b.pdf?index=trueIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_f86fdac3bf6a45f2b40f699f3ab69882.pdf?index=trueIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_f5fd045b08634e49bda6aa4d8790116d.pdf?index=trueIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_f613cd210454469f95b2566961a0200c.pdf?index=trueIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_4ac9845fd8dc422c91160af53eab4920.pdf?index=trueIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_275c9f400c1343708c2e4c0591689a9e.pdf?index=trueIn PDF document text
    • http://ligujizulogi.atwebpages.com/jutavodip.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD9 5212 bytes
SHA-256: ceed19ad042d0f9342fb0241ce0081fbf7ca35a8710f893d13b81701c1d00922
font_01_sfnt_off00010d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9F 10800 bytes
SHA-256: 678dd3ac3105e0ad6622f330da9b9c81d7e6a3af88e80751f035aa47a8a92cd8

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