Malicious PDF — malware analysis report

Static analysis result for SHA-256 1543e73bf53a7986…

MALICIOUS

PDF

53.3 KB Created: 2020-05-30 01:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34cd82152f6b3585dc2c13d89c97ca59 SHA-1: 234736cfb4906efc7b4c35b715ed15bd002154e6 SHA-256: 1543e73bf53a7986f3373ea13f7d966aeda93bbcf8e915f8ab2644f03786cf8e
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ML_NYX_PDF_MALICIOUS heuristic also strongly indicates malicious intent. The embedded URLs likely serve to direct users to malicious websites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://chengxinzaixianbaijiale.br3h.com/uploads/1/3/1/4/131456363/131456363.html#lucas+days+of+our+lives
    • http://2d5.undesirable.us/uploads/1/3/0/6/130620929/0926bb5eacbf667.pdf
    • http://blinkforbusiness.com/uploads/1/3/1/6/131606149/sufat.pdf
    • http://satyenshah.com/uploads/1/3/0/7/130740401/ad6ad.pdf
    • http://nicheconsultingservices.com/uploads/1/3/1/8/131856995/3d0d6e17796e5d.pdf
    • http://janecallen.com/uploads/1/3/0/3/130323214/lixuziwelariwir.pdf
    • http://teddyvilla.com/uploads/1/3/0/5/130541763/4886575.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a480.bin
723ea7f9631c694d4605f56a51a966dc858c28e10757287c8dd4754f60cd7c9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA480 11076 bytes

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