Malicious PDF — malware analysis report

Static analysis result for SHA-256 40819ac2f67bc94f…

MALICIOUS

PDF

33.2 KB Created: 2020-05-25 15:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 337643c21709b1a7ce335008b2c4020f SHA-1: 077d4481b819b59362b5c47649129121cb5b7312 SHA-256: 40819ac2f67bc94ffd40e6e042672470c54d69e17eaea5f797a72ea1916d70ec
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. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though partially corrupted, contains several URLs that are likely part of this link farm, suggesting the primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://youprettygirl.org/uploads/1/3/0/6/130604642/130604642.html#brasucade+de+moule
    • http://learningsparx.com/uploads/1/3/0/5/130542865/369963.pdf
    • http://dongreys.com/uploads/1/3/1/3/131381761/5191082.pdf
    • http://grangerwebdesign.com/uploads/1/3/1/0/131071019/nujoj.pdf
    • http://jamesdolan.sucks/uploads/1/3/0/9/130969562/5771688.pdf
    • http://roadkill17.com/uploads/1/3/0/5/130588418/jawudebumijoxigu.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_off0000500c.bin
fb47c1ff6e92ab1ebd36a36917a0d7b2d35cc3e70ef60e16d4d83d3b1c4ff01a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x500C 13624 bytes

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