Malicious PDF — malware analysis report

Static analysis result for SHA-256 95dc7e10e6c1da71…

MALICIOUS

PDF

33.9 KB Created: 2020-05-20 00:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2606c11a91a226c6b612b6acb437812 SHA-1: 8a228f36dd66c44a68684c806f7503f0f1757f31 SHA-256: 95dc7e10e6c1da71997045f29819798d9db4e2ed557c1cc54154b14ddbbd8a77
94 Risk Score

Malware Insights

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

The PDF document contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or a distribution mechanism for further malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine a more specific attack pattern beyond the link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://esquirenw.com/uploads/1/3/0/5/130544547/130544547.html#india+worksheets+printable
    • http://extps.org/uploads/1/3/1/4/131437350/c4b7e4deb9c66.pdf
    • http://ontariomotorcyclelaw.com/uploads/1/3/0/5/130543366/600106.pdf
    • http://philipgilliverauthor.com/uploads/1/3/1/3/131398521/ff7b8347c.pdf
    • http://gigpodcast.com/uploads/1/3/0/6/130604523/perixowopezun.pdf
    • http://sophiemultiservicesllc.com/uploads/1/3/1/8/131871583/fegitokiruxas-doruxamelel-nufujolixugape-nizexup.pdf
    • http://reidenterprisesllc.org/uploads/1/3/0/4/130476012/muwara.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_off00005a3b.bin
6ed5735818fd914304c8443d0a3f4820b0ea3ac42b4709774d0b98b94f3ab818		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A3B 10260 bytes

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