Malicious PDF — malware analysis report

Static analysis result for SHA-256 1229e8428da1db13…

MALICIOUS

PDF

60.1 KB Created: 2020-04-02 04:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f096b4e9c05b7e68abfe7781b655f56b SHA-1: 3dd74040d73a0d65c7e185f04544b9ab62e17ac8 SHA-256: 1229e8428da1db13c3efadefbea479649213330d345e97b7ca77a0a4f66aea28
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF file contains a heuristic firing for a link farm, indicating it hosts a large number of external links to other PDF documents. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs suggest a tactic to distribute or link to a large volume of content, potentially for SEO manipulation or to host malicious payloads. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://michaudwellness.com/uploads/1/3/0/6/130604320/130604320.html#adinkra+symbols+names+and+meanings
    • http://mrsac.net/uploads/1/3/0/4/130435500/zumejozi_jetogodemu.pdf
    • http://hapcrowdfund.com/uploads/1/3/0/9/130969383/bezonifadale.pdf
    • http://ilsassonelpozzo.it/uploads/1/3/1/1/131163761/kibupomok.pdf
    • http://peacefulwaterscounseling.org/uploads/1/3/0/5/130539108/1324321.pdf
    • http://amazingkreationssc.net/uploads/1/3/0/3/130323182/teredufux.pdf
    • http://rwtbankrupt.com/uploads/1/3/0/4/130483349/6028879.pdf
    • http://fix-myorthotics.com/uploads/1/3/0/4/130483565/mubaviwobexip_fexotir_siwiguf_fonalur.pdf
    • http://themouseholewoolery.com/uploads/1/3/0/7/130775634/3dda9.pdf
    • http://tilecontractorshouston.com/uploads/1/3/0/7/130775476/wodorexukibenegixux.pdf
    • http://texasworld.xyz/uploads/1/3/0/8/130874565/8944748.pdf
    • http://christine-carney.com/uploads/1/3/0/6/130640163/2fb157c21af5d9.pdf
    • http://74-123-75-207.mgwnet.com/uploads/1/3/1/0/131070849/4183708.pdf
    • http://pelicanbriefconsult.com/uploads/1/3/1/4/131483278/kojon-xokage.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab7b.bin
75f8911ed2f68c102f28e0366cac40225df7e63f678123887ff81afc11d89be0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB7B 8876 bytes
font_01_sfnt_off0000cd34.bin
6928d90e12d19dc382ba8c82e1cdc53272fa8b8ed2ed7db0bf937e0b53289b8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD34 16188 bytes

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