Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b379e95efb7a39…

MALICIOUS

PDF

37.1 KB Created: 2020-03-07 10:32:34 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 147550675776722c247ca12b52e95ea3 SHA-1: df9b476a77ad2fb19c8cfd72644c6b85243c1b11 SHA-256: c7b379e95efb7a39569b32503a4ce42fcaf59f02263bfd392f88dfb3880615b8
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO poisoning or to distribute malicious content. The document body, though heavily obfuscated, contains references to PDF conversion and includes numerous URLs pointing to various domains. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm, suggesting the primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://sta-66-99-58-204.ladse.org/uploads/1/3/0/5/130551957/130551957.html#convertir+pdf+vers+word+small+pdf
    • http://www.oceanbeachmv.com/uploads/1/3/0/4/130488578/483501efcb13647.pdf
    • http://nirvanastorage.net/uploads/1/3/0/7/130738889/nobagisifenababi.pdf
    • http://franfabrique.com/uploads/1/3/0/4/130493816/tulibawonoloz.pdf
    • http://cpanel.expertlinemarking.com.au/uploads/1/3/0/7/130740264/fac9c.pdf
    • http://isellthis.net/uploads/1/3/0/4/130488157/2294b32474fba53.pdf
    • http://arreglosgratis.com/uploads/1/3/0/3/130313638/7378424.pdf
    • http://paradoxicalreality.net/uploads/1/3/0/8/130874053/vutodabe-letol.pdf
    • http://commercialfinishes.org/uploads/1/3/0/6/130604793/535a269.pdf
    • http://unanomade.com/uploads/1/3/0/6/130620998/nivatatugaziwu.pdf
    • http://hollybabiarz.com/uploads/1/3/0/7/130739197/1d78ec.pdf
    • http://guemeschannelembroidery.com/uploads/1/3/0/6/130621628/6100178.pdf
    • http://www.christopherberglundcareer.com/uploads/1/3/0/6/130639721/8007039.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_off0000653a.bin
bd91fa08305004654860187db575b032942e793d4b626fe287dc2683ce8dd2f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x653A 9368 bytes

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