Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a77f5ed38f52a5c…

MALICIOUS

PDF

44.1 KB Created: 2018-11-30 20:31:51 +03:00 Authoring application: PDF CoDe 2015.5473 (c) 2002-2015 European Commission
MD5: 473530d87b80051b420a239bbb6b8e3d SHA-1: df9bcc742f80069fc7ec90af6b76a73687ded082 SHA-256: 5a77f5ed38f52a5ceceaa8bbbaa91c7efa2dd1efc6a445dd5d1e4106d580352f
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to external PDF files, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier also flagged this document as malicious. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8439

Heuristics 2

  • 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.
  • 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://www.gorillawalker.com/booth-bunnies-a-kevin-kell-collection.pdf
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    • http://www.gorillawalker.com/english-society-in-the-eighteenth-century-second-edition-the-penguin.pdf
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    • http://www.gorillawalker.com/5-minute-feasts-stir-fry-gourmet-cooking-for-two.pdf
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    • http://www.gorillawalker.com/buddhanokotobawotsutaetaihontonobukkyoenomichishirube-japanese-edition-kindle-edition.pdf
    • http://www.gorillawalker.com/candy-cane-kisses-and-enchanted-embraces-10-holiday-romances-by.pdf
    • http://www.gorillawalker.com/art-and-truth-after-plato.pdf
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    • http://www.gorillawalker.com/conditions-for-criticism-authority-knowledge-and-literature-in-the-late.pdf
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    • http://www.gorillawalker.com/spectroscopy-with-coherent-radiation-selected-papers-of-norman-f-ramsey.pdf
    • http://www.gorillawalker.com/famous-houses-and-literary-shrines-of-london.pdf
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    • http://www.gorillawalker.com/necropolis.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://www.aiim.org/pdfa/ns/extension/
    • http://www.aiim.org/pdfa/ns/schema#
    • http://www.aiim.org/pdfa/ns/property#
    • http://www.aiim.org/pdfa/ns/id/

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