Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0695acbe5958e51…

MALICIOUS

PDF

35.3 KB Created: 2020-04-11 15:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f1dd337b87e824ffd72589e6d73bb572 SHA-1: 466f72279657acd4a2367c73c905007044075f49 SHA-256: d0695acbe5958e518c905eb76e930862d2f29949a18bd153ac308ed0e5daf483
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to other PDF files hosted on various domains, indicating a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious. The embedded URL 'http://pamedellin.com/uploads/1/3/1/0/131070688/131070688.html#atlanta+compromise+speech' is likely the primary lure, suggesting a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://pamedellin.com/uploads/1/3/1/0/131070688/131070688.html#atlanta+compromise+speech
    • http://musicinthevale.org/uploads/1/3/0/3/130323835/b3d4322782ef68c.pdf
    • http://adam-butler.net/uploads/1/3/0/4/130436202/8068207.pdf
    • http://everythingelectriconline.com/uploads/1/3/0/7/130738972/9843498.pdf
    • http://hqwallpapersfree.com/uploads/1/3/1/3/131379605/2178655.pdf
    • http://handmadedogbeds.com/uploads/1/3/0/4/130476372/vukufusoravab.pdf
    • http://camilo-leon.com/uploads/1/3/0/4/130436173/368652.pdf
    • http://lockedupoutfittinginc.com/uploads/1/3/0/5/130541000/bacdb0f8.pdf
    • http://hqwallpapersfree.com/uploads/1/3/1/3/131379605/2178655
    • 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_off00006645.bin
6b4a2ac3f938e0de38b35da5116d68fc7cb89d9f0a8535d0dd8cd7faf8d25a5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6645 7272 bytes

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