Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ce951acf36a686…

MALICIOUS

PDF

46.9 KB Created: 2020-06-19 13:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 267f0ce25079fe1c15fc4ed497747865 SHA-1: 1a86c5720e988cbdd3a95568494e48dd1afce158 SHA-256: 36ce951acf36a6862fdee7b9b61dc534a531a97fd10ee3b5df303d5161259ce1
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, many of which appear to be part of a link farm. The ML classifier also flagged this PDF as malicious. The primary purpose appears to be directing users to external content, potentially for SEO manipulation or to host malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ramintaksipalvelu.fi/uploads/1/3/0/8/130874385/130874385.html#nuvi+1340t+manual
    • http://el038.elrepco.com/uploads/1/3/0/5/130551072/vorimapabowefuxu.pdf
    • http://fortunatedogcookies.com/uploads/1/3/0/6/130604498/bemavek.pdf
    • http://put-your-big-girl-pants-on.com/uploads/1/3/2/3/132303248/6250332.pdf
    • http://47u.undesirable.us/uploads/1/3/1/4/131453429/15205069.pdf
    • http://allthemagnets.com/uploads/1/3/1/8/131858592/b2b1a591c7b.pdf
    • http://ameliavaughan.com/uploads/1/3/1/3/131380505/9130773.pdf
    • http://locupleto.net/uploads/1/3/0/2/130289247/1981036.pdf
    • http://webdisk.devriendelijkesint.nl/uploads/1/3/0/7/130739318/nitofuguwosi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065f2.bin
039a7143d9305f751df7535ad7eb4fe482748223ec15caaaf58e26fde500950d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F2 4684 bytes
font_01_sfnt_off000075cc.bin
6ed1533ae2ebd77ceea37e3b462a584c98248c18e9c73a2658e391e1c98a528a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75CC 10844 bytes
font_02_sfnt_off00009ae0.bin
87bac7116cce17a810d08151410b930347e6d8b8f011720992609d67c697163a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AE0 16064 bytes

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