Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb37d312e73571b…

MALICIOUS

PDF

35.6 KB Created: 2020-04-04 07:40:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dcc9ec3269da698c8784351522b9ca19 SHA-1: 3b1c25a22755c97640787bcc0b53def85f754703 SHA-256: 5fb37d312e73571bb366166ddef238bb92279a07cb6c672f0a1bdfac06f7f3c5
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, many of which point to PDF files with numeric slugs. This pattern is indicative of a link farm or SEO manipulation tactic, often used to host or redirect to malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

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://valleyleadershipk12.org/uploads/1/3/0/9/130969270/130969270.html#potencial+de+reposo+y+potencial+de+accion
    • http://shivamfenceandlandscaping.com/uploads/1/3/0/6/130605339/9996165.pdf
    • http://teamconstructors.com/uploads/1/3/0/9/130969141/xalaliwu.pdf
    • http://drechris.com/uploads/1/3/0/9/130969572/lofonumiz_xudijo.pdf
    • http://flowerpoweratl.com/uploads/1/3/0/5/130590763/fogagotan.pdf
    • http://richardthevet.com/uploads/1/3/0/6/130621130/xozanowoxo.pdf
    • http://meademechanical.com/uploads/1/3/0/2/130289278/zewufavi_xafufosoma_divobefiben.pdf
    • http://stephenbralley.com/uploads/1/3/0/3/130313410/tejiburefewuw_fowozajut_saruvalosiwivu_bugit.pdf
    • http://mpaclarke.com/uploads/1/3/1/3/131383333/ronuninenowu.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_off00006058.bin
272509693826ebf8d0f17e0fef6eac5f148b5bfa384cb14001b97e5fb5fad1c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6058 8660 bytes

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