Malicious PDF — malware analysis report

Static analysis result for SHA-256 69a5a3dd9fb04904…

MALICIOUS

PDF

38.0 KB Created: 2020-06-17 02:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d23cea3c5995c66246ec8125b2c2298 SHA-1: 2fef6038cfeb49d8e3213fa90eee00b2e65af9e9 SHA-256: 69a5a3dd9fb049046b3e8b0ed963a52c572272000dbde71aa7202ca380ed8b13
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or a distribution mechanism for further malicious content. The ML_NYX_PDF_MALICIOUS heuristic also strongly indicates malicious intent. No scripts were extracted, but the sheer volume of external links is highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://salomonk.com/uploads/1/3/0/4/130483903/130483903.html#mn+dot+drivers+manual
    • http://tomichhill.com.au/uploads/1/3/1/3/131383251/dubagu.pdf
    • http://escalloniajewellerycrookhaven.com/uploads/1/3/1/3/131381225/gugezabi.pdf
    • http://ninahairandmakeup.com/uploads/1/3/1/4/131409909/bf298c80ed6e0.pdf
    • http://blackwolfinvestment.com/uploads/1/3/0/6/130621361/8d65d6.pdf
    • http://bodyworkshebden.com/uploads/1/3/0/7/130739235/dobukinofaxike_vofojeruloxo_lerusorusikupoj.pdf
    • http://jenest.co/uploads/1/3/0/7/130739021/dibal-bajiwitolilin-gekejawal-dogesubosejo.pdf
    • http://cpanel.fetefam.com/uploads/1/3/0/6/130621214/gekokonojuwu.pdf
    • http://rosecityinspections.com/uploads/1/3/0/3/130323811/besenogozifazaxezoj.pdf
    • http://holisticwritingbyseth.com/uploads/1/3/0/5/130588834/pelafij_kojivelitijan_taletux_nupuminogabag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059b7.bin
df38eadd95cf5e541db408de8143f876b517bca4cfe32b73658bc3b9764baaa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59B7 4920 bytes
font_01_sfnt_off00006a5c.bin
e0feb2d57555fe02aa6f7c817a9c6d77c88fb209a147ccb36ebbf67902f54dab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A5C 9892 bytes

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