Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84e13265ee1cb63…

MALICIOUS

PDF

36.8 KB Created: 2020-04-13 16:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 274ac1fb29927c83163059c46890ddf2 SHA-1: 62d422dcbe798165c6b6ef1a32ac6a62d43c4b43 SHA-256: f84e13265ee1cb63925fd3b20fbe28845b24815f391acef9ac11dccc57d0694a
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique commonly used in SEO spam or link farm attacks. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this behavior, indicating the document's primary purpose is to redirect users to a network of malicious or low-reputation websites. The ML classifier strongly supports the malicious verdict.

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://totalpackageessentials.com/uploads/1/3/0/5/130543995/130543995.html#introduccion+a+la+geografia+regional+del+mundo+pdf
    • http://cancelingtimeshare.com/uploads/1/3/1/4/131453753/dogafukofisiwoz.pdf
    • http://suburbanhennepinhousingcoalition.com/uploads/1/3/0/6/130639753/d72d787.pdf
    • http://corexploration.org/uploads/1/3/1/3/131398176/fusazixawefagug.pdf
    • http://claytonmorrisassociates.com/uploads/1/3/0/5/130589140/xinonaneseloxipovu.pdf
    • http://alaskjohn.com/uploads/1/3/0/5/130545557/6177671.pdf
    • http://diablomotorcycleco.ca/uploads/1/3/0/7/130776811/3193509.pdf
    • http://havanawaytransportinc.com/uploads/1/3/1/4/131437667/tepabif.pdf
    • http://mjyoga.net/uploads/1/3/1/4/131410479/319674.pdf
    • http://rankya.in/uploads/1/3/0/6/130639484/9528980.pdf
    • http://sophisticatedpreserves.com/uploads/1/3/0/2/130289233/8581089.pdf
    • http://matchflorida.net/uploads/1/3/0/6/130604550/velowajuvuxekeme.pdf
    • http://lakewoodelementary.net/uploads/1/3/0/2/130289648/nodexenalof.pdf
    • http://matchflorida.net/uploads/1/3/0/6/130604550/velowajuvuxek
    • 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_off000065b1.bin
52a3fee555f54f13f7c0c0765345b935ba6b47743474b3d9f9e7dbef2ae8e2b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B1 8356 bytes

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