Malicious PDF — malware analysis report

Static analysis result for SHA-256 62283f054c32ef6c…

MALICIOUS

PDF

30.6 KB Created: 2020-04-08 05:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8f513948447a4f29171f266fa4b5b79c SHA-1: d2c92e06aa072a0206df393a51ac05af5d6ca664 SHA-256: 62283f054c32ef6cb2b959262a20a1884d2961efed403b0e1dd7d1747eb094d4
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains. This pattern is indicative of a link farm or a mechanism to distribute malicious content across multiple sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is not benign. No scripts were extracted, and the document body text is largely unreadable, so the primary indicators are the numerous external URLs.

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://articsinc.net/uploads/1/3/0/4/130491001/130491001.html#te+doy+gloria+gloria+pista
    • http://writersplot.com/uploads/1/3/0/6/130639744/nirolilazagexibub.pdf
    • http://jsaglobalrecruiting.com/uploads/1/3/0/3/130323794/jazumawon.pdf
    • http://yoursaivianteam.com/uploads/1/3/0/2/130289336/bunamozule.pdf
    • http://andriaandkurt.com/uploads/1/3/0/9/130969489/metezepu_wodawad_befenaja_sisufirujo.pdf
    • http://stmfraldas.com/uploads/1/3/1/4/131452743/4338734.pdf
    • http://livewellbeactive.com/uploads/1/3/1/3/131383536/zoxigejuxanobavabomi.pdf
    • http://born2behealthydeals.com/uploads/1/3/0/6/130620869/3d32b1.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_off00004af2.bin
3e22cbbf8b1a06c4e0ac4efa87e3271484ab3f12a286b8091124c358fb6870f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AF2 9276 bytes

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