Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea55cdfd7f3e990…

MALICIOUS

PDF

35.5 KB Created: 2020-04-10 06:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 94cbf12ef9f5c8802ac1d412ea172244 SHA-1: 7f69b5ec7c0c73862ca3c7b2a308a9ec8f0a4f59 SHA-256: 0ea55cdfd7f3e990cc5cae51613a43ec5b1ae854c97d2cb209bae2fa21942471
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of external links to other PDF files hosted on various domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the embedded URLs suggest a link farm or redirection scheme, potentially for SEO manipulation or to distribute further malicious content. The primary attack pattern involves directing users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mckbenna.com/uploads/1/3/0/9/130969539/130969539.html#palabras+en+idioma+balines
    • http://crossroadsumcanderson.org/uploads/1/3/0/4/130491001/dejagesikapupuzuxex.pdf
    • http://setantaceol.com/uploads/1/3/0/8/130874623/933644.pdf
    • http://lavadorascomerciales.com/uploads/1/3/0/6/130620854/7126130.pdf
    • http://goodfun.events/uploads/1/3/1/4/131453853/gerolasuwizaso-fobid.pdf
    • http://simplifyyourlifeconcierge.com/uploads/1/3/0/5/130550723/7416381.pdf
    • http://emiliawkorte.com/uploads/1/3/0/2/130289760/wuvel.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_off0000609e.bin
e00be24e6b057ad3b83c4653d292e8fac2f2bbbdb359a497cafce37cf5522121		 pdf-font-stream PDF embedded font (sfnt) at offset 0x609E 8516 bytes

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