Malicious PDF — malware analysis report

Static analysis result for SHA-256 246187c679dd1089…

MALICIOUS

PDF

35.8 KB Created: 2020-04-10 23:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e15392264140a697f1969b3bba03cd4b SHA-1: 3f443ea12efd6e0b0fd9a5164efcf06b0821de4a SHA-256: 246187c679dd108980b5237bb609723ea59190cfe89f65d6d0bbd22db5f8e927
96 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded external URLs pointing to various domains. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, indicating a likely attempt to manipulate search engine results or redirect users to potentially malicious content. The ML classifier also strongly suggests maliciousness. No scripts were extracted, and the document body is largely unreadable, making the link farm the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://davidmarquesibanez.com/uploads/1/3/1/1/131163691/131163691.html#le+papa+de+serge+panine+mots+crois%C3%A9s
    • http://penguinfoodtogo.com/uploads/1/3/0/6/130620943/noselugiwewu.pdf
    • http://recalibrateministries.org/uploads/1/3/0/7/130739445/3093214.pdf
    • http://newnextsf.com/uploads/1/3/0/3/130313196/e9380.pdf
    • http://glynnpt.com/uploads/1/3/0/5/130588599/bazugumap_miwewe_xaretorabevora_sebutu.pdf
    • http://zacharysmith.org/uploads/1/3/0/5/130541662/ba549022e.pdf
    • http://crystalholly.com/uploads/1/3/0/6/130639308/077bf0bc5991c.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_off00004e35.bin
c1bb77ca9ad29159d1635d72e528150c5dd52dc3f057860cad1e7aa169d5ac14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E35 8380 bytes
font_01_sfnt_off00006c14.bin
1dcc9e5fb8190f8f9835765bced5ee9fc01d482694773a8bd3c962672970d54c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C14 16104 bytes

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