Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f3fd684f22db98…

MALICIOUS

PDF

35.0 KB Created: 2020-03-15 08:13:28 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 48b92ade104ea37e2f0d729399908c4e SHA-1: 6c6642dcc74f8dc7db36aaa98c33092b44350a51 SHA-256: 72f3fd684f22db98b74a3ceee0f9f81f49f18b346be79ad97c29f26447063dc7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are dynamically generated and point to other PDF files, indicating a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious. The embedded URLs are likely used to redirect users to malicious content or phishing pages.

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://c024lm.bdgct.com/uploads/1/3/0/7/130738727/130738727.html#basic+flower+structure+worksheet
    • http://www.iamktmusic.com/uploads/1/3/0/6/130621409/bebaforeduk.pdf
    • http://notesfromearth.co.uk/uploads/1/3/0/5/130541271/4491025.pdf
    • http://www.nataliayaldo.com/uploads/1/3/0/7/130738603/dasifizaped.pdf
    • http://ashleylanawheat.com/uploads/1/3/0/5/130545784/5527862.pdf
    • http://ragingshitpile.net/uploads/1/3/0/4/130483765/bikepaviwogovane.pdf
    • http://broadsword.com.au/uploads/1/3/0/3/130379183/kuduv.pdf
    • http://www.shropshirekennels.co.uk/uploads/1/3/0/6/130639082/9320383.pdf
    • http://iwakeupwithmakeup.net/uploads/1/3/0/4/130488387/f9bd920d3de06.pdf
    • http://mostlytech.com/uploads/1/3/0/5/130590138/f401472e88.pdf
    • http://kayleighpeddie.com/uploads/1/3/0/5/130539241/fedawet_lunirolowokozaw_rugabosogabev.pdf
    • http://www.gripitandripitgloves.com/uploads/1/3/0/4/130491063/a0796d.pdf
    • http://kevinachen.com/uploads/1/3/0/2/130289692/pawewolosivulaxo.pdf
    • http://ruanntiller.com/uploads/1/3/0/7/130740084/sademali.pdf
    • http://14inparis.com/uploads/1/3/0/6/130604152/4372845.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_off00005e45.bin
91009fca3bb7f48a5c28a61ce72143a980716a56f04da417198774a29cb4c15c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E45 7980 bytes

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