Malicious PDF — malware analysis report

Static analysis result for SHA-256 62fb3132fd499ea0…

MALICIOUS

PDF

34.8 KB Created: 2020-04-28 16:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2e9fbde3da1b376a7d64ca766095d4d6 SHA-1: 2c11445a93e11a6e0a970346621fd15d9da1ad9d SHA-256: 62fb3132fd499ea005f7ae3a7f83acdd1f7029afa19c14ab00e672e48f14753b
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files hosted on similar domains. This behavior is indicative of a link farm or a mechanism to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 4

  • 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.
  • 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://bougeebox.com/uploads/1/3/0/5/130588603/130588603.html#sea+vee+390z+performance
    • http://theriverviewcourtrv.com/uploads/1/3/0/8/130813885/8510673.pdf
    • http://kasparianappraisal.com/uploads/1/3/0/2/130270753/nenafuko.pdf
    • http://amenrolltide.com/uploads/1/3/1/4/131407424/8833ec1a0.pdf
    • http://steveshenk.com/uploads/1/3/0/3/130313539/2e236.pdf
    • http://thepurplepetalstore.com/uploads/1/3/1/3/131379059/7337139.pdf
    • http://rhs69reunion50.com/uploads/1/3/1/4/131407647/5156212.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005eec.bin
5e80241f4dbc95fdc135e30facee460ab48790bcbcef90ab3c8b8bf2851c3b95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EEC 8468 bytes

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