Malicious PDF — malware analysis report

Static analysis result for SHA-256 02ede96da204c8d7…

MALICIOUS

PDF

47.7 KB Created: 2020-03-26 04:17:26 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: aed39e9536993f62143c0f9efda69d81 SHA-1: 0562bf54658e9c9bcf17383b908c37d0f224a791 SHA-256: 02ede96da204c8d74248999aa930d74afb6640cd60afbe6f01fba72d3ef96c23
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The embedded document body text, though corrupted, contains fragments of URLs and text related to 'micosis oportunistas ppt', suggesting a potential lure or spamming activity. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to a vast network of external PDF files, likely for SEO poisoning or to host further malicious content.

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://adventureinstincts.com/uploads/1/3/0/9/130969274/130969274.html#micosis+oportunistas+ppt
    • http://maskcarabeautycolormatch.com/uploads/1/3/0/6/130604065/wamomozuxujukif-beduzafexid-solerinovufuk-nenur.pdf
    • http://ramweedhuis.com/uploads/1/3/0/6/130604562/7144455.pdf
    • http://conceptarian.com/uploads/1/3/0/6/130604863/juvepobasebo-weradijijem-gadoxobuzi-kagawiv.pdf
    • http://santafepowerwashing.com/uploads/1/3/0/7/130775108/tifadirawetovik_mozigev_voxawazavisaz.pdf
    • http://flyandcomfy.com/uploads/1/3/0/7/130738707/ee7335572.pdf
    • http://www.archaya.org/uploads/1/3/0/5/130544539/duvegaluvarabun.pdf
    • http://batterytownsend.com/uploads/1/3/0/7/130740323/bigubafol.pdf
    • http://www.dunaecrenwelge.com/uploads/1/3/0/9/130969016/8695739.pdf
    • http://www.talkinshops.com/uploads/1/3/0/4/130476563/fofibuvi.pdf
    • http://www.northshorefirefund.org/uploads/1/3/0/5/130540072/2d87b7d4cfd.pdf
    • http://le-manuel-du-tage-2.fr/uploads/1/3/0/5/130539810/7709174.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_off00008d65.bin
2516b4c235e76a2e4d5536c43b2aed8f593a864cc9a0d645e724ef59528790d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D65 9952 bytes

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