Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef86cabd24405ff5…

MALICIOUS

PDF

41.7 KB Created: 2020-04-12 23:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ae29c18218888e5efd051e7feaf6cc11 SHA-1: 065dffa885f641b022c8fd06b8130fdf6701a312 SHA-256: ef86cabd24405ff5820103832e58dcaf51e2f4a75991d63f1aa358070eab72d2
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of external links to other PDF documents hosted on various domains, characteristic of a link farm or SEO spam campaign. The document body, though partially corrupted, contains text related to technical project feasibility and mentions wkhtmltopdf, suggesting it's a generated document. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to potentially malicious content via a mass of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://paintingsofrobertclements.com/uploads/1/3/0/5/130542983/130542983.html#factibilidad+tecnica+de+un+proyecto+pdf
    • http://talkeetnaadventurelodge.com/uploads/1/3/0/4/130476185/pokas.pdf
    • http://tinajasrl.com/uploads/1/3/0/9/130969137/3037103.pdf
    • http://eastcentral.beer/uploads/1/3/1/4/131410434/fb480752e333416.pdf
    • http://kelceyfredette.com/uploads/1/3/1/1/131163590/c0106fa223f2.pdf
    • http://exceptionail.net/uploads/1/3/1/0/131071188/zatazaxodos.pdf
    • http://heritagerailwayreview.com/uploads/1/3/0/7/130775476/3321209.pdf
    • http://jens-kemper.net/uploads/1/3/0/6/130620997/kixusewisunawi-fapetubapug-dadavat-sifinilefi.pdf
    • http://holdempreciousmetals.net/uploads/1/3/0/3/130379167/nidibanujaxuk-lotujigelibijuf.pdf
    • http://carefree-efficiency.com/uploads/1/3/0/5/130545895/pupota.pdf
    • http://skygrovewellness.com/uploads/1/3/0/7/130738616/9757458.pdf
    • http://chicfete.ca/uploads/1/3/0/7/130776824/tubusekibusefaf_xotetoten_pirexokubukano_mepataxel.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_off000077d7.bin
f0bd25dcdbc0bf11acc4dfc664047e0819c85044ffc4d25439d57a3f50b064e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77D7 9224 bytes

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