Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c71111c5dc2de5…

MALICIOUS

PDF

35.7 KB Created: 2020-06-14 22:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9b3bb91f09f1c18a8286ccbc0c8d1a5 SHA-1: 4150c54f81a8ba5bb31c7046f584eca9a36db79c SHA-256: f6c71111c5dc2de5e4f5d0113694f49edab291b97fc9f0d3697a08a81de4792f
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various domains, a technique commonly used for SEO poisoning or to redirect users to malicious content. The PDF_SEO_LINK_FARM heuristic specifically identifies this behavior. The ML classifier also strongly indicated maliciousness. The document body text, though garbled, contains references to lesson plans and the wkhtmltopdf tool, suggesting a lure to disguise the malicious link farm.

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://envgovcontext.net/uploads/1/3/0/8/130814995/130814995.html#australian+primary+school+lesson+plans
    • http://nounoucergy95.com/uploads/1/3/1/4/131482859/37490a5ba557.pdf
    • http://oeufrier.ca/uploads/1/3/0/2/130272937/supalorof.pdf
    • http://kohlpaintinganddrywall.com/uploads/1/3/0/5/130539759/woral_nigogirodu.pdf
    • http://operationupward.org/uploads/1/3/0/4/130435589/3b7bbb48e1.pdf
    • http://stephaniepereira.com/uploads/1/3/0/5/130542863/molimu-datodamavoto-sirego-zuxizegope.pdf
    • http://nicholepowell.com/uploads/1/3/0/9/130969758/xefigusoge.pdf
    • http://mx.bowriderboats.ca/uploads/1/3/0/2/130289541/busubutokalujunuba.pdf
    • http://sandycheeks.org/uploads/1/3/1/3/131398278/fasoxusugelipunonu.pdf
    • http://vision-band.com/uploads/1/3/0/4/130436299/9ff57677dff89.pdf
    • http://thisoklahome.com/uploads/1/3/0/4/130491599/495807.pdf
    • http://wolfecityhomecoming.com/uploads/1/3/0/3/130379049/vigira.pdf
    • http://doseofhaute.com/uploads/1/3/0/8/130874023/zagekurofaz.pdf
    • http://furryfriendbed.com/uploads/1/3/0/7/130775759/8ed8a80077bc5.pdf
    • http://kaylee-online.com/uploads/1/3/1/1/131163693/eb2afe16c38f.pdf
    • https://zuzujosu.files.wordpress.com/2020/06/zidew.pdf
    • https://xavizatilem439575075.files.wordpress.com/2020/06/rudirefibovu.pdf
    • https://kekewozubaso.files.wordpress.com/2020/06/63758329472.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_off00005f21.bin
c440d109b41721491642508de7e56e61b93009c863a79ca0d9a590ef99520ba7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F21 10440 bytes

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