Malicious PDF — malware analysis report

Static analysis result for SHA-256 94d45beedc160e62…

MALICIOUS

PDF

37.4 KB Created: 2020-04-08 15:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 234b9bacbe2dd848359051a4b41b8f0e SHA-1: 08fa12b49a60cfc1e9081a35f11e05bd62403c57 SHA-256: 94d45beedc160e62754a253ae62e13f700e9d9e37908269f61fd2a0f85b23998
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains one of the external URLs, suggesting a deliberate attempt to create a link farm. This pattern is often used to manipulate search engine rankings or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://derousodesigns.com/uploads/1/3/0/8/130873877/130873877.html#concepto+de+planificacion+estrategica+en+educacion
    • http://laracriminallaw.com/uploads/1/3/0/7/130775405/telopunesadutipewuw.pdf
    • http://attractinginspiration.com/uploads/1/3/0/4/130435644/2108593.pdf
    • http://busenbites.com/uploads/1/3/0/2/130273573/diwabub.pdf
    • http://valterfeleja.com/uploads/1/3/0/7/130776182/bc3873.pdf
    • http://rainydayzleggings.com/uploads/1/3/1/3/131382470/05345ab8e.pdf
    • http://icareeracademy.net/uploads/1/3/0/4/130477335/wurigukimo_pagajuna_voxobil_jiruzisazi.pdf
    • http://kindermusikindy.com/uploads/1/3/0/4/130476161/sosufikog-wajisegi-xelomaxiberogu.pdf
    • http://luvsbirds.com/uploads/1/3/0/7/130739938/4f5974.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_off0000694a.bin
a2052844f3dd7beccb5f6fdfc41da2a10e9978c7139bdea1b3b3481a6adc7b4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x694A 8052 bytes

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