Malicious PDF — malware analysis report

Static analysis result for SHA-256 058f015d9bd20d01…

MALICIOUS

PDF

38.6 KB Created: 2020-04-10 13:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5dcb6594792f521604b419d863d76345 SHA-1: 2e3f17167beb83344ef745008dc629169ef87dec SHA-256: 058f015d9bd20d016648ac11ecfa3a16da195b10bc553c00b1570f704a24de33
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, many of which point to other PDF files on unrelated domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. 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 direct users to potentially harmful resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://hplministries.org/uploads/1/3/0/2/130272353/130272353.html#mothership+zeta+crew
    • http://finnbjornerud.com/uploads/1/3/0/5/130588821/6706714.pdf
    • http://ultralightbabes.com/uploads/1/3/0/2/130288430/7317507.pdf
    • http://theburp.org/uploads/1/3/1/4/131437385/3582571.pdf
    • http://thejourneybeginswith.com/uploads/1/3/1/0/131069750/tiwilawu.pdf
    • http://sydneyft.com/uploads/1/3/1/3/131381605/tazekopo.pdf
    • http://thecozyrustic.com/uploads/1/3/0/2/130287953/sipip_muwobazuj_bekopi.pdf
    • http://saomaianh.net/uploads/1/3/1/1/131163959/tanidufi.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_off00006e4e.bin
635669661482f8ad4c317aab1dab7c3b44115504f4e21302111c306af8827acb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E4E 8304 bytes

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