Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e2266a7fb5f163a…

MALICIOUS

PDF

45.6 KB Created: 2020-04-10 03:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e37b879794d088c76e5d38f2779588bd SHA-1: cfa15bc4a8868bca326beb7616b38bc73604153c SHA-256: 9e2266a7fb5f163aca18e6b852bb7ec8729ee6ab39869231f82beb670f033322
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting this assessment. No scripts were extracted, limiting the ability to determine specific payload delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://flavorstw.com/uploads/1/3/0/5/130590203/130590203.html#concepto+de+capacidad+fisica+en+el+ser+humano
    • http://oldsagepublishing.com/uploads/1/3/0/4/130476452/c6b2fbdbf0dc095.pdf
    • http://wildshore.org/uploads/1/3/0/2/130289166/5367714.pdf
    • http://evolvecic.com/uploads/1/3/0/2/130289466/difaxe.pdf
    • http://limmylicious.com/uploads/1/3/0/6/130622009/viwixiruvax.pdf
    • http://dennistheflash.com/uploads/1/3/0/5/130588240/xisimolikanexaporino.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_off00008786.bin
aef9f1c268f39cf98903a0e96da5776f4f6c90f0c38948a09464be1199715ab9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8786 9076 bytes

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