Malicious PDF — malware analysis report

Static analysis result for SHA-256 666fe47e210a4b05…

MALICIOUS

PDF

38.7 KB Created: 2020-04-06 09:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 366cb935d33b856df77b7d6e142263ef SHA-1: c706f4ef2902347402301cb255d7745dc4c31f32 SHA-256: 666fe47e210a4b05e0cf020fa7fcdb7d3411080e5c179326d41b90c1ba18035e
136 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDFs with numeric slugs, indicating a potential link farm or SEO manipulation scheme. The heuristic 'PDF_SEO_LINK_FARM' strongly suggests this malicious intent. The presence of a 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests that the document might be intended to trick users into believing they need a password to access content, which is a common social engineering tactic. No scripts were extracted, but the numerous external links are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://nadavscbd.net/uploads/1/3/0/7/130775347/130775347.html#diferencia+cmyk+rgb
    • http://martyobey.com/uploads/1/3/0/3/130312964/jejulorubutejodiwub.pdf
    • http://iesrichmond.org/uploads/1/3/0/9/130969742/7ab89.pdf
    • http://ourbeautifulfeet.org/uploads/1/3/0/7/130738769/fa21b1a6a.pdf
    • http://studioixalma.com/uploads/1/3/1/3/131398444/nejivevokak-rigilifezo-kegow-xalaza.pdf
    • http://lawncareofbatonrouge.com/uploads/1/3/0/6/130604050/9cdb32155d.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_off00006cc1.bin
e73280acd9a009436cb1e11d314613860f889f915ac08c3c254cbed9ca557c79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC1 9000 bytes

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