Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c76d282852d082…

MALICIOUS

PDF

34.7 KB Created: 2020-04-05 11:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 30488c93e6cd7781aefa93fd951158d6 SHA-1: 52afe9e1777c2f8676347f7908fa00114258b24d SHA-256: 09c76d282852d0822d3a97a78b3f37ee6ad820176343fbd766b17ac82db5648f
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files on unrelated domains, indicating a link farm or distribution network. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious or SEO-manipulated content.

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://bsa-sccc-pack301.com/uploads/1/3/0/3/130323542/130323542.html#caracteristicas+de+una+caricatura+periodistica
    • http://longislandalp.com/uploads/1/3/0/6/130620769/juzisefot-jijolekim-velobovotuzoze.pdf
    • http://aerocarbon.net/uploads/1/3/0/2/130289240/lolil.pdf
    • http://marmar-and-coco.com/uploads/1/3/1/4/131406732/af2f8a6b9a.pdf
    • http://stoneddreams.net/uploads/1/3/0/6/130639170/2ade2090ced5e.pdf
    • http://catv47.com/uploads/1/3/1/4/131405962/4785346.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_off00005e5b.bin
27f3c94f6fce18577b837dd38eca5721b6c446dba7c3d7aa53f06eb9e0c060d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E5B 8228 bytes

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