Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b61150bb8184969…

MALICIOUS

PDF

34.3 KB Created: 2020-04-14 16:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e88643de5025072b05aec4e5db018151 SHA-1: 25657859f56c6f9438c06c096726c88f95e30d70 SHA-256: 2b61150bb8184969d453090c84e4ef0553a8eafc5f6acf1b6d92a9b2fd939224
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://thelittleredschoolhouseelc.com/uploads/1/3/0/5/130539735/130539735.html#call+of+heroes+movie+free
    • http://mytdao.com/uploads/1/3/0/6/130639887/kafok-xozusimuna.pdf
    • http://scooter-ljubljana.com/uploads/1/3/0/5/130590314/01059855548729f.pdf
    • http://winnerconsolidatedholdings.com/uploads/1/3/0/7/130740561/lidipewoxu.pdf
    • http://ttslighting.com/uploads/1/3/1/3/131380985/cc1b902.pdf
    • http://clewerpuppets.com/uploads/1/3/0/4/130489351/9001900.pdf
    • http://coffeevalleyksa.com/uploads/1/3/1/4/131454883/377342.pdf
    • http://16007th.com/uploads/1/3/0/5/130551927/4643275.pdf
    • http://cremacaramelo.com/uploads/1/3/0/6/130604452/8160484.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e57.bin
f6f5f0e5154240c9acd46ba10f09f9cc5b9a8ab20f7fddeba08d542dbadbebb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E57 8088 bytes
font_01_sfnt_off00006d81.bin
960dd57c3d710fb5912cf8870fb37a5ed2896725b32003e62c84a1314704f66a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D81 4804 bytes

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