Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63de246f390a54b…

MALICIOUS

PDF

30.3 KB Created: 2020-06-01 05:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09e6b6317caf74e8c2ceea81044a34d3 SHA-1: 3d27d4b071d564fe047502ddc3e4cc8968307645 SHA-256: c63de246f390a54b34a512ee6317c140a472ba3309e2aab94cdc555bcff57a80
94 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Stage Capabilities: Gather Victim Identity Information T1204 Malicious Link

The PDF file contains a large number of external links, many of which point to other PDF files on various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates this is likely a link farm designed to manipulate search engine results or distribute content. The embedded document body text, while partially garbled, includes a URL that is also present in the list of extracted URLs, suggesting a coordinated effort to direct users to these external resources. No scripts were extracted, and the primary malicious activity appears to be the distribution of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://nursingarmpillow.com/uploads/1/3/0/6/130604536/130604536.html#ejercicios+de+espa%25C3%25B1ol+para+quinto+de+primaria
    • http://enigmarockband.com/uploads/1/3/0/7/130739351/3448998.pdf
    • http://secure.bearcatmusic.org/uploads/1/3/1/3/131381003/luveto.pdf
    • http://andyrev.com/uploads/1/3/0/3/130313242/e3130fb.pdf
    • http://camirefamily.com/uploads/1/3/1/4/131453046/ditajiranoliletiki.pdf
    • http://joshlaw312.com/uploads/1/3/1/3/131383309/xevumebituzap_limitulenugaru_ramaz.pdf
    • https://zetamuse.files.wordpress.com/2020/05/wibuvukovepepaton.pdf
    • https://mufumileroko.files.wordpress.com/2020/05/81635605605.pdf
    • https://ziwamol.files.wordpress.com/2020/06/ruviwulamivuzu.pdf
    • https://tiwipur.files.wordpress.com/2020/05/juvano.pdf
    • https://wemuwitez.files.wordpress.com/2020/05/39207094641.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_off00004c69.bin
123157213fada7d7fa0e3051a503ec80d887a7a4d4110c4259e004cf039874fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C69 9764 bytes

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