Malicious PDF — malware analysis report

Static analysis result for SHA-256 c026bf84964c5f71…

MALICIOUS

PDF

36.4 KB Created: 2020-06-02 13:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a2c24f9354e62dabf95b4a9fd8f6737 SHA-1: 3f14ceb5136355d2d98b11f8657557b51fc08e08 SHA-256: c026bf84964c5f71825dc7610e15e9c1ca21c2ed17a56d9afb745fdd85cd72d5
96 Risk Score

Malware Insights

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

The PDF contains a significant number of external links pointing to various domains, a pattern identified as a 'PDF_SEO_LINK_FARM'. The primary URL, http://bud.market/uploads/1/3/1/0/131070579/131070579.html#colm+meaney+filmer+og+tv-serier, is part of this network. This suggests the document's purpose is to drive traffic to these linked pages, which are likely designed for SEO manipulation or to host further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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://bud.market/uploads/1/3/1/0/131070579/131070579.html#colm+meaney+filmer+og+tv-serier
    • http://mmasgeneralhouse.info/uploads/1/3/1/4/131453984/4082481.pdf
    • http://arbeti.com/uploads/1/3/0/5/130590153/5943346.pdf
    • http://webmail.kiddozindoorplay.com/uploads/1/3/0/8/130813642/kivadejijufekoduruf.pdf
    • http://lsxperts.com/uploads/1/3/0/9/130969868/f95eff8d18ca725.pdf
    • http://bud.market/uploads/1/3/1/0/131070579/terms.html
    • http://bud.market/uploads/1/3/1/0/131070579/dmca.html
    • http://bud.market/uploads/1/3/1/0/131070579/policy.html
    • https://puvewuxo.files.wordpress.com/2020/06/7091468056.pdf
    • https://witinubaxa.files.wordpress.com/2020/05/1906961025.pdf
    • https://duzixegave.files.wordpress.com/2020/05/levudodolirosevi.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_off0000626b.bin
011ec09ca8c1f2d976f35a33a3413878ed9f52da74948e845280581a3d19fc22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x626B 10516 bytes

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