Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdcc1ce4e69a7721…

MALICIOUS

PDF

38.9 KB Created: 2020-06-04 16:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ae6f6e28540634e7f3b09cc26911e3f SHA-1: fbc63b4cd22afcdbac0e2f9d3e249a2df25753d1 SHA-256: bdcc1ce4e69a772165d3de552ec806c5decb4ebafc72c28beeae367e31c17885
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a large number of external links, characteristic of a link farm. The document body, though partially corrupted, contains URLs that are also present in the extracted URL list. These URLs point to various PDF files hosted on different domains, suggesting a coordinated effort to distribute content or manipulate search engine results. No scripts were extracted, and the primary malicious activity appears to be the distribution of links.

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://usgss.us/uploads/1/3/0/6/130621689/130621689.html#necromunda+imperial+guard
    • http://serenityreflexology.org/uploads/1/3/0/5/130588703/8624020.pdf
    • http://galwaywindows.com/uploads/1/3/0/6/130639407/kiwosufev-rexazanukud-tefojos.pdf
    • http://mahaservice.net/uploads/1/3/1/6/131637021/2534383.pdf
    • http://oliartesa.com/uploads/1/3/0/2/130287991/kutilogo.pdf
    • http://usgss.us/uploads/1/3/0/6/130621689/terms.html
    • http://usgss.us/uploads/1/3/0/6/130621689/dmca.html
    • http://usgss.us/uploads/1/3/0/6/130621689/policy.html
    • https://jujinoku.files.wordpress.com/2020/06/23849531005.pdf
    • https://tisamipaf.files.wordpress.com/2020/06/40523638660.pdf
    • https://paxaweki176183565.files.wordpress.com/2020/06/jaxixopomebod.pdf
    • https://rigiwuwas.files.wordpress.com/2020/06/70845877586.pdf
    • https://xavodurumumo.files.wordpress.com/2020/06/76119980155.pdf
    • https://bunazixuvavu.files.wordpress.com/2020/06/64531234675.pdf
    • https://zarenorazer.files.wordpress.com/2020/06/pixezotoreji.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bde.bin
a264db3c6cd43b1cbe00a09571eefbdbd2ca7c25a4d43de8c14d13a8851ca6ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BDE 10648 bytes

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