Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a4619c71f7d9e8…

MALICIOUS

PDF

34.4 KB Created: 2020-04-11 22:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e7a8491fab311f1a5c89c958e612d048 SHA-1: af817cdbb4547032b938e5c55cde1005c8e72182 SHA-256: 09a4619c71f7d9e8d8123fc3b4814590e54ff9d7c0318edf212d9eff455dd428
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially harmful content, possibly as part of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://andmerchant.org/uploads/1/3/0/8/130814623/130814623.html#funciones+del+almacenamiento+en+la+nube
    • http://akshayshrimanker.com/uploads/1/3/1/4/131453649/paxeka_nokafoja_lidad.pdf
    • http://okkcheers.com/uploads/1/3/0/6/130604327/nixiva.pdf
    • http://activate-mac.com/uploads/1/3/0/3/130323126/guramajojow.pdf
    • http://2cs.org/uploads/1/3/0/6/130621666/4c63d8159b5b.pdf
    • http://thetapestry.space/uploads/1/3/1/4/131483143/88153b255d4b.pdf
    • http://resolverestoration83.com/uploads/1/3/0/9/130968963/jison.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_off00005d12.bin
be08e265258a78537f20038ec9cb07e3c3f5537c4c75582c4a20a5a9ce4e84a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D12 8536 bytes

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