Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b28a43d652d57e…

MALICIOUS

PDF

33.8 KB Created: 2020-04-15 11:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ed5f18f21534b403cd30fc5d1b60d18e SHA-1: 97b8ca3461fd29f0b25db4f47d65061a9ca537b5 SHA-256: a5b28a43d652d57ebfaf0491ee32827fbf67092321ae5717bb37f3c2df33c3f1
72 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to other PDF files hosted on various domains. This pattern is indicative of a link farm designed to distribute malicious content or to obscure the true origin of a threat. The heuristic 'PDF_SEO_LINK_FARM' strongly suggests this malicious intent. No scripts were extracted from this sample, limiting the ability to determine the exact payload or further actions.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://xspyra.com/uploads/1/3/1/3/131398288/131398288.html#b%C3%A9la+bart%C3%B3k+mikrokosmos+pdf
    • http://mr-monticello.com/uploads/1/3/0/5/130589042/towovolo-jezepepavopugum.pdf
    • http://aniascards.com/uploads/1/3/0/5/130539756/911b876.pdf
    • http://wakesurfau.com/uploads/1/3/1/4/131407370/2163726.pdf
    • http://petsinnsuites.org/uploads/1/3/0/7/130739128/kaxevufejobusew.pdf
    • http://gendernaturalism.com/uploads/1/3/0/5/130588337/sajimozudaxemem.pdf
    • http://arindam-bhattacharya.com/uploads/1/3/0/9/130969636/9805245.pdf
    • http://openhivemind.com/uploads/1/3/0/8/130814729/88c0f400e.pdf
    • http://nacanation.com/uploads/1/3/0/6/130620616/retunowuvekifewur.pdf
    • http://nexacreativeconsulting.com/uploads/1/3/1/3/131382239/9085908.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_off00005aa0.bin
f1351678983899936b408270dd898f559012f6e37079d00f64b47dccea6cf581		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AA0 8132 bytes

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