Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ecdf3fd5e13320…

MALICIOUS

PDF

35.6 KB Created: 2020-04-11 08:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 07ad92f4c8f5bd0206f1235d153a0b03 SHA-1: cbeb0b55be39b841823e6662365b365989e874c9 SHA-256: 90ecdf3fd5e133202b8f60530b7d2adcad101128a90e56d4703b80d61b7d6d28
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document was flagged by a machine learning classifier as malicious with a high confidence score. It contains a significant number of external links, many of which point to domains that appear to be part of a link farm designed to host further malicious content. The presence of numerous PDF files with numeric slugs in their URLs suggests a pattern of SEO poisoning or a similar deceptive linking strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://bejustalittlebetter.com/uploads/1/3/0/5/130589168/130589168.html#steering+the+craft+epub
    • http://vittoriovini.net/uploads/1/3/1/0/131069744/1833066.pdf
    • http://jetrevenue.com/uploads/1/3/1/4/131453681/gelebuvinivaneko.pdf
    • http://beoutre.com/uploads/1/3/0/6/130604368/datasunezosisa.pdf
    • http://rivelazioniprivate.org/uploads/1/3/0/4/130436239/resaviripovajosok.pdf
    • http://zacbarnes.com/uploads/1/3/0/5/130542971/365d125d1181b.pdf
    • http://filidomfoundation.org/uploads/1/3/0/7/130739103/a13aed628.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_off000064e8.bin
bf570a5bb11b04f5c37129b40d4fba2a723924560c49b7b7419f8a229407e415		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E8 7784 bytes

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