Malicious PDF — malware analysis report

Static analysis result for SHA-256 058683a345fc9a03…

MALICIOUS

PDF

34.2 KB Created: 2020-04-09 03:40:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2418daad3fa793f5c2867d18bc961ab8 SHA-1: 6bbad015b6d56fda7dc44d96617d770da4da17a2 SHA-256: 058683a345fc9a0338c84a141b3615b9e79bef216b1b09f64b619bd6be6a34ab
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 other PDFs with numeric slugs, indicating a potential link farm or SEO manipulation scheme. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the presence of numerous external URLs suggests a malicious intent to redirect users to potentially harmful 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://eleritunstallweddings.com/uploads/1/3/1/0/131069759/131069759.html#definition+of+political+parties+meaning
    • http://sdemmerle.com/uploads/1/3/0/2/130272638/temumafujo.pdf
    • http://preparingforaction.org/uploads/1/3/0/6/130620657/jemedowela_rawaxifu_wamubuxunipo_gexawa.pdf
    • http://icandoallthingsmaintenance.com/uploads/1/3/0/6/130621111/cba9868.pdf
    • http://1815cio.org/uploads/1/3/0/2/130270977/3595075.pdf
    • http://familiamdei.com/uploads/1/3/1/3/131379629/79c742212939154.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_off00005e65.bin
201f7f9ac2e34b2ac1174c2b8e8adaade55d42b8d35a0f24f70a1605dcab6b97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E65 7624 bytes

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