Malicious PDF — malware analysis report

Static analysis result for SHA-256 934e6e85c5575270…

MALICIOUS

PDF

32.1 KB Created: 2020-05-31 07:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb78b468c1e76d8b6d0a872d7b1eafcd SHA-1: 434f6147143566298ac837e53514c8b74f743f13 SHA-256: 934e6e85c5575270c03155da469c66d0d1b00a89f71cd20f8e823a0fcb6f3666
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or distribution mechanism. The ML classifier also flagged this PDF as malicious with a high probability. The document body contains seemingly random text and URLs, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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://homestagingprofessionaltraining.com/uploads/1/3/0/5/130540304/130540304.html#dell+inspiron+620+release+date
    • http://diekunstderfuehrung.de/uploads/1/3/0/3/130313454/dajugorode_xemoze.pdf
    • http://spiritcreekpublishing.com/uploads/1/3/0/6/130639077/tefinusun_rozamosumafigo_nudek.pdf
    • http://kramer.hcinets.com/uploads/1/3/0/6/130603715/podinevatiwajef_tinor_fawigoxewe_mupuzikawarolo.pdf
    • http://upmconsulting.com/uploads/1/3/1/6/131606101/3880289.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_off000052e8.bin
f2590c11190fe1442fdbafbbcbac9cf6bbbeb5609115a55e9bbfbbda3313feb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52E8 10004 bytes

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