Malicious PDF — malware analysis report

Static analysis result for SHA-256 4103d3a06fa4e800…

MALICIOUS

PDF

36.9 KB Created: 2020-03-15 14:45:36 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a57530512d649af6f973b9ca72c09cf8 SHA-1: b5fe1d5c2e896b8319efe9a72d9862f89d56a265 SHA-256: 4103d3a06fa4e8009a5a2148de74d3b577d1d603cd4fdf02c7b443769e7a7ffb
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to other PDF files hosted on various domains, indicative of a link farm or SEO poisoning attack. The document body is heavily obfuscated, but the presence of numerous external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest the intent is to drive traffic to these linked resources. No scripts were extracted, limiting further analysis of payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://www.capo-modding.com/uploads/1/3/0/6/130604010/130604010.html#sugar+report+palliative+care+wales
    • http://queenbeebeauty.net/uploads/1/3/0/4/130476748/a1da7fb.pdf
    • http://bbernardco.com/uploads/1/3/0/7/130775275/6055440.pdf
    • http://www.wwonderwriter.com/uploads/1/3/0/7/130776605/2497750.pdf
    • http://www.thediytrials.com/uploads/1/3/0/2/130273582/jozuripipazoji_pibaga.pdf
    • http://sassyfrassy.com/uploads/1/3/0/4/130488063/kikozuzanenu-luzajaf.pdf
    • http://girlytwirl.com/uploads/1/3/0/6/130639760/wefatifobawoturom.pdf
    • http://thailand-travelling.com/uploads/1/3/0/2/130289436/niwugozaxelixulazovo.pdf
    • http://earthangelofchrist.org/uploads/1/3/0/5/130546519/gozajadubawi-novetawug.pdf
    • http://broodjesboke.com/uploads/1/3/0/4/130476272/bifareke_pemaga.pdf
    • http://dansconcept.com/uploads/1/3/0/8/130814063/605f9c67.pdf
    • http://coffschamber.tdconx.com/uploads/1/3/0/8/130873779/gurop-mixenelan-jovofulefapube.pdf
    • http://runstrong-ie.org/uploads/1/3/0/4/130483684/dabobumile-ravuriragixex-kipibumosemufom.pdf
    • http://curiousbeans.com/uploads/1/3/0/6/130604848/71b8fb8.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_off000068a3.bin
6ceae5a1dae91bd0ad738d2790b10913a395879cc14376edaf96ce128c7af503		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68A3 7228 bytes

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