Malicious PDF — malware analysis report

Static analysis result for SHA-256 627731d08fc5215b…

MALICIOUS

PDF

36.2 KB Created: 2020-04-06 03:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 83ba97f55f21633e8265d804ab4cd728 SHA-1: d3d557c5ec375abea5824b55497ef63c8aa63dbb SHA-256: 627731d08fc5215bc587c14a90277859649e7b7a767805ae9b1ce335bfb14a98
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains. This behavior is indicative of a link farm or a method to distribute malicious content across multiple sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, but the sheer volume of external links suggests a coordinated effort to redirect users.

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://mayneislandchamber.com/uploads/1/3/0/4/130476188/130476188.html#ejercicios+de+mediana+y+moda+resueltos
    • http://ismurfystrans.com/uploads/1/3/0/9/130969041/2932988.pdf
    • http://miznora.com/uploads/1/3/0/4/130488165/xibom.pdf
    • http://msmcdaniel7thgradeclass.com/uploads/1/3/0/5/130544089/woxabubuwalu-rokiguzuv-faxuv-tujugefumanimit.pdf
    • http://cusbymar.com/uploads/1/3/0/2/130289662/xuwiwadisatupop.pdf
    • http://astray.xyz/uploads/1/3/1/0/131070852/7945713.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_off0000627e.bin
d71da5cea4cbdb30d84de19e6ff1d48dd681531aa3d33e32b5e90795507efb54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x627E 8772 bytes

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