Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c2ec478927871c…

MALICIOUS

PDF

44.5 KB Created: 2020-04-08 13:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e526ff5312515b857979c2f96b2593e3 SHA-1: 12869ce3db24001cc71bf4d8ffe9f62a68f1711a SHA-256: d5c2ec478927871c109ce86574641ac9348a17e4891c58d5c42a8b7070bd99c4
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, many of which point to other PDFs hosted on similarly structured domains. This pattern is indicative of a link farm designed to manipulate search engine rankings or distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://urbanvertical.ca/uploads/1/3/0/4/130435726/130435726.html#harry+potter+characters+and+their+patronus
    • http://doubledutycleaning.com/uploads/1/3/1/3/131379824/5621232.pdf
    • http://buffyesos.com/uploads/1/3/0/8/130815124/5114513.pdf
    • http://heathershelpinghands.net/uploads/1/3/1/3/131384718/6318084.pdf
    • http://glowinggoddessbeauty.com/uploads/1/3/0/3/130323633/3707029.pdf
    • http://daianaerose.com/uploads/1/3/0/6/130640031/bidune_xubepewe_vamunagewala.pdf
    • http://equidog-positively.com/uploads/1/3/0/8/130813769/a98f85f91c53.pdf
    • http://ginadalfonzo.net/uploads/1/3/0/7/130738562/fupirot-pajur.pdf
    • http://xposcroll.net/uploads/1/3/0/7/130739291/3fe12aafa263.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_off00008668.bin
42ea178ad32a1b420e17a34c7dd8a26ad13c5a03ad1e051ef07134efd5b5f2ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8668 7892 bytes

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