Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d6b92ae02f4ce8…

MALICIOUS

PDF

34.8 KB Created: 2020-04-13 08:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2a9b9853400ca7ae51f153b19cc14860 SHA-1: 5ed6a9e984fcf014e3710e52f6d353c838a79e7a SHA-256: 58d6b92ae02f4ce85281ffaa1840a0e96cf478042b5271896fb160cb471fd0bf
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains that appear to be part of a link farm designed to host malicious content. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains a reference to 'Marco conceptual casos practicos' and a URL, suggesting a lure to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bucolicbeaver.com/uploads/1/3/0/8/130814200/130814200.html#marco+conceptual+casos+practicos
    • http://yelenaorrelly.com/uploads/1/3/0/4/130436139/6e704a5.pdf
    • http://valleylakescleaners.com/uploads/1/3/1/4/131453969/9846992.pdf
    • http://measuredspaces.com/uploads/1/3/0/6/130621337/1cd87b21e5e7c80.pdf
    • http://brunner.ae/uploads/1/3/0/7/130739309/wigaxo-zomaromozub-rifamon.pdf
    • http://julianaherd.com/uploads/1/3/0/4/130435884/e996a5fecd7ea5.pdf
    • http://solutionstoprotectwhatmatters.com/uploads/1/3/1/3/131380746/mobuxukufujovodu.pdf
    • http://endlessindulgence.com/uploads/1/3/0/6/130621113/8d1916.pdf
    • http://naranjojewelers.com/uploads/1/3/0/7/130739366/1270917.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_off0000609a.bin
494d932c35d821796601c054c34e6d667d9f0259af33279e0d64199ccf247547		 pdf-font-stream PDF embedded font (sfnt) at offset 0x609A 8452 bytes

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