Malicious PDF — malware analysis report

Static analysis result for SHA-256 619431dfb75e424f…

MALICIOUS

PDF

35.7 KB Created: 2020-06-04 06:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4dfa1ba55e3596485fcb9ed129756a84 SHA-1: be019eef54146c288078099aa250c347bb7f624f SHA-256: 619431dfb75e424f5c4b00677a97f254961fe985a89793a28d6765f9242b7e72
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO spam operation. The document body, though partially corrupted, contains text related to 'Libros de derecho mexicano' and references the wkhtmltopdf tool, indicating a deceptive lure. The presence of embedded URLs and the ML_NYX_PDF_MALICIOUS firing strongly suggest malicious intent, likely to direct users to malicious or spam content.

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://connallylab.com/uploads/1/3/0/9/130969481/130969481.html#libros+de+derecho+mexicano
    • http://mta-sts.mx.partyfavorband.com/uploads/1/3/1/3/131382141/fafudowovizewokesek.pdf
    • http://ryanstead.com/uploads/1/3/0/6/130604515/51195.pdf
    • http://stayathomesoldier.com/uploads/1/3/0/9/130968984/6744863.pdf
    • http://thefirstresponsegroupllc.com/uploads/1/3/1/3/131381963/julexikuz.pdf
    • http://connallylab.com/uploads/1/3/0/9/130969481/terms.html
    • http://connallylab.com/uploads/1/3/0/9/130969481/dmca.html
    • http://connallylab.com/uploads/1/3/0/9/130969481/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://kewewigo.files.wordpress.com/2020/06/wuwavigakelagubotiritis.pdf
    • https://zajojow.files.wordpress.com/2020/06/90213494517.pdf
    • https://bewapixez.files.wordpress.com/2020/06/riwutederirikurew.pdf
    • https://bamosuto.files.wordpress.com/2020/06/5775667884.pdf
    • https://juzifak.files.wordpress.com/2020/06/58281303958.pdf
    • https://gagubajugi234726942.files.wordpress.com/2020/06/jupubatijejiz.pdf
    • https://gavilot137689634.files.wordpress.com/2020/06/rivozizumagagufivo.pdf
    • https://gevaxetevada.files.wordpress.com/2020/06/norutinewagora.pdf
    • https://zolukid.files.wordpress.com/2020/06/subiwakefu.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d3d.bin
ec0c3d2720295c27d2e2392599e7b3fe1609c362712f09d72762ea4a07f177eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D3D 11472 bytes

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