Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b5b54cd50f81c2…

MALICIOUS

PDF

37.9 KB Created: 2020-06-19 08:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e10ae827c2b824fbf30e2049f1e7af3c SHA-1: 8d39f7119c5916bca13b7b1ca9949c357f07ebaa SHA-256: 40b5b54cd50f81c2de4ca1fdb1898729177a837e96ac439943834a5cc8aa3dfd
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to various domains, a technique commonly used in SEO link farms. The ML classifier strongly indicated maliciousness. The embedded URLs suggest a redirection scheme, potentially leading to further malicious content or downloads. No scripts were extracted, limiting the analysis of direct payload execution.

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://autumneyre.com/uploads/1/3/1/3/131398187/131398187.html#thin+film+deposition+methods+pdf
    • http://getfimf.com/uploads/1/3/0/4/130490277/2798166.pdf
    • http://sunday-soap.com/uploads/1/3/0/6/130604598/6312601.pdf
    • http://leojai.com/uploads/1/3/0/2/130289655/limufizebumanunomezi.pdf
    • http://memsart-gallery.com/uploads/1/3/0/2/130288439/sebuselado.pdf
    • http://maggietham.com/uploads/1/3/1/0/131070247/82d00eee.pdf
    • http://rockandstar.com/uploads/1/3/0/6/130620494/zadowilorenedepujepu.pdf
    • http://documenteddouche.com/uploads/1/3/0/2/130271023/5546634.pdf
    • http://mgservicios.net/uploads/1/3/0/4/130489909/tefoxagi.pdf
    • http://vanderlegal.com/uploads/1/3/0/5/130546457/kebumeseluzora-boginanavujaxu.pdf
    • http://hostmaster.exporttogroup.com/uploads/1/3/0/6/130639554/delitizivinod.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_off000057ae.bin
d7724efca253fd6aec40919d323c6aae6489f5982aa90e65904965e65ab900f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57AE 4712 bytes
font_01_sfnt_off00006775.bin
798519390ce4f80bc6bd0f9eaf856d071d55f60273f9dc0e0d1be56f76d93b61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6775 10148 bytes

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