Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5fd58960d724a08…

MALICIOUS

PDF

30.2 KB Created: 2020-04-15 23:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 33784ded288a6dcc5c9ada85d39b4ba5 SHA-1: 5f6c7b98137de3053d87a9a6388e52667791035a SHA-256: e5fd58960d724a08cdfe4a11c068312ff3e5c7c2c386a9637f51cb6ad27e7d91
94 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Gather Victim Identity Information T1204 User Execution

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 unrelated domains, suggesting a link farm or content distribution tactic. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, and the document body is heavily obfuscated, but the sheer volume of external links is highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://glbconcretellc.com/uploads/1/3/0/2/130287852/130287852.html#avengers+infinity+war+trailer+2++3gp
    • http://gauravs.in/uploads/1/3/0/5/130590338/xunilelipojix.pdf
    • http://healthandaccountability.com/uploads/1/3/0/5/130543141/lofasatari_kimafev.pdf
    • http://gmtotalservices.com/uploads/1/3/0/6/130620808/saxurenagomul.pdf
    • http://cfhmhawaii.com/uploads/1/3/0/9/130969346/82d6cee83f.pdf
    • http://fityourbody.eu/uploads/1/3/0/5/130590770/vuwej.pdf
    • http://easierlivingathome.com/uploads/1/3/0/7/130775447/gezejizosot_busorunilivixix_segurefetexo_zopevevojaxo.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_off00004dce.bin
df43bd8080bf8a63e920730c8970999cbf8d8ddb2ae9e02f92339fd7b1cf8610		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DCE 8028 bytes

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