Malicious PDF — malware analysis report

Static analysis result for SHA-256 516440e7d4a0db08…

MALICIOUS

PDF

36.5 KB Created: 2020-05-14 21:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08d90cb5e1d89de3c870c0b0babddfc5 SHA-1: 18624e5449872019a41470f1f408bf16f25679d0 SHA-256: 516440e7d4a0db082af6e0f8efc51628e121d15056ab640e2ccc2c932254e8b8
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or distribution mechanism. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the sheer volume of external links indicates a malicious intent to redirect users or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://makevotingmatter.net/uploads/1/3/0/6/130604731/130604731.html#cahiers+de+doleances+pdf
    • http://noebrown.com/uploads/1/3/1/1/131164249/f9226.pdf
    • http://lydiapion.com/uploads/1/3/1/4/131483955/xidugaguv.pdf
    • http://bhpmedicalconsultants.com/uploads/1/3/1/6/131636700/5358727.pdf
    • http://mytradeconsult.com/uploads/1/3/1/4/131453843/velumuz.pdf
    • http://my143puyallup.com/uploads/1/3/1/4/131454771/4110623.pdf
    • http://tasteinthedark.com/uploads/1/3/0/7/130776212/rovose-budutawaligi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053c9.bin
b17e6a8139eb3ffd9ca804dd8dcfd0f8c3ed6d33428020ed82734a5a49c0a7dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53C9 4044 bytes
font_01_sfnt_off000061db.bin
f9afff74fa33904553655b55d71c0b55d5fef76d4b268130ed41769a2c3037c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61DB 10612 bytes

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