Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffdf9eddb0f8aae1…

MALICIOUS

PDF

38.1 KB Created: 2020-03-09 12:20:53 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2c42984b2ac796c493c4589e07e50539 SHA-1: 88ad89e75a32af1c833412246c29a4ee9a7a4553 SHA-256: ffdf9eddb0f8aae1a6241e89ad48fb916fe86ffad65b41c494f7cb600c2740e4
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to a multitude of external resources, likely to distribute malware or engage in phishing. No scripts were extracted, and the document body was heavily obfuscated.

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://host242.carmichaelnl.com/uploads/1/3/0/2/130288532/130288532.html#andaman+nicobar+map+upsc
    • http://phoenixwebtest.com/uploads/1/3/0/6/130622104/ponizefema.pdf
    • http://www.vakantiecotedazur.com/uploads/1/3/0/6/130620705/mazaxutukexoxo_mekexu_gonuje.pdf
    • http://sheldonpeck.net/uploads/1/3/0/5/130588906/jerenosofefaxop_xukosib_furige.pdf
    • http://demdforward.com/uploads/1/3/0/7/130739662/wobunozutano.pdf
    • http://hosaac.co.uk/uploads/1/3/0/2/130270993/e24e9bc297dd165.pdf
    • http://mostprograms.net/uploads/1/3/0/2/130289551/mezoripisaxibu_fopar_voxarexuvod_dedalugafamo.pdf
    • http://killerbeetriathlon.com/uploads/1/3/0/5/130551130/sutuvar-birikixug-xakilukiw-mifadew.pdf
    • http://greatlakesmt.com/uploads/1/3/0/5/130538987/xuteg_wilejanenomal_vafozugopewomux_vodil.pdf
    • http://www.janellecaballero.com/uploads/1/3/0/6/130621557/6681cc65a77.pdf
    • http://justskies.com/uploads/1/3/0/2/130291724/f39d1c.pdf
    • http://psychictiina.com/uploads/1/3/0/7/130739951/tarizasokaler.pdf
    • http://finnance.com/uploads/1/3/0/2/130289244/9e62c96526b3c7.pdf
    • http://mercedesudaeta.com/uploads/1/3/0/6/130639947/vekudilajudewipej.pdf
    • http://unattendedsalesaustralia.com/uploads/1/3/0/2/130288468/vifem.pdf
    • http://abcofxxx.com/uploads/1/3/0/4/130476145/dolef-kirolobevi.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_off00006cc1.bin
c5fe48b6318f5f751bae24d5ceb23341aeda6f08f481428f40831f93f7e0d44a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC1 8088 bytes

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