Malicious PDF — malware analysis report

Static analysis result for SHA-256 1959ede30d932214…

MALICIOUS

PDF

38.8 KB Created: 2020-03-21 02:58:38 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 38e7b5284d852582193454637505177f SHA-1: ef2450b657b653fbf6a54bf09e6a30605da05d8c SHA-256: 1959ede30d9322143cfb9dc1e5e174b91fa3efc07a453bdda728bd1655bfc191
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though heavily obfuscated, contains URLs that are also present in the heuristic findings, suggesting a coordinated effort to direct users to a network of linked PDF documents.

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://ourbetahalf.com/uploads/1/3/0/6/130639152/130639152.html#analisis+sintactico+modificadores+del+sujeto+y+predicado+ejercicios
    • http://www.svdptc.org/uploads/1/3/0/6/130639228/714370.pdf
    • http://ownmurrieta.com/uploads/1/3/0/7/130739452/kovuwokoxixe.pdf
    • http://ms-gillespie.com/uploads/1/3/0/5/130540928/6011347.pdf
    • http://bexaralliance.org/uploads/1/3/0/6/130639750/bexefasadi.pdf
    • http://protechmydevice.com/uploads/1/3/0/4/130476760/edb061fd611734.pdf
    • http://www.seesaabloganalysis.com/uploads/1/3/0/2/130291365/8acb621a619b38.pdf
    • http://compassionatelivingcourse.com/uploads/1/3/0/6/130620987/35155f5b956e2f.pdf
    • http://sexzinlace.com/uploads/1/3/0/7/130775511/2923065.pdf
    • http://demenagementcd.com/uploads/1/3/0/2/130289703/9612079.pdf
    • http://poetrycult.com/uploads/1/3/0/7/130739053/zirijekusixu.pdf
    • http://metcalfe4pa.org/uploads/1/3/0/5/130551543/ce7a95c4475a.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_off00006da0.bin
79739633a8be9d232b2327df79142bc383e18afb6fc20f308ba2797a41001b16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA0 8660 bytes

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