Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f3c930e6590932c…

MALICIOUS

PDF

42.9 KB Created: 2020-04-08 09:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 47ae54081281d66ab06af2278e5b94c9 SHA-1: 16e87b4b880ec6cb2ad45339cb91585f36a6a414 SHA-256: 0f3c930e6590932c7f292284d55e95da290dd4638b05a6ee005627c787555ddf
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, directing users to various domains. The document body, though partially corrupted, includes a URL that appears to be a lure for further malicious activity. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to potentially harmful 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://kompletekleaningsolutions.net/uploads/1/3/0/5/130551536/130551536.html#ejemplo+de+una+estrategia+global+de+mejora+escolar+para+secundaria
    • http://oneagleswingsbiz.com/uploads/1/3/0/7/130775632/6522e0e674e8.pdf
    • http://thecampcoach.org/uploads/1/3/0/9/130969931/gerepatalan.pdf
    • http://mastercraftt.com/uploads/1/3/0/6/130620233/9745281.pdf
    • http://rexburgrealestateagents.com/uploads/1/3/0/7/130775259/a0e1a9.pdf
    • http://faithlutheranmarysville.org/uploads/1/3/0/2/130289636/5370342.pdf
    • http://suomenstreetworkout.fi/uploads/1/3/0/3/130323400/judopivobibulam-tuzuzesifobame.pdf
    • http://wearnonline.com/uploads/1/3/0/2/130289772/biwudojit.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_off000079af.bin
0f9ca36561e212c668f64f6b672b3cb163d70078e3608042ad8077c9b5752390		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79AF 10008 bytes

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