Malicious PDF — malware analysis report

Static analysis result for SHA-256 4407924026240b08…

MALICIOUS

PDF

47.1 KB Created: 2020-03-30 10:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 08c1e82be18e6eefddefa6c10034b8f1 SHA-1: d05f3da4be949f9a93e59e1037bba2714ff13d44 SHA-256: 4407924026240b085c33727f1048e67db5caa14fda02e1414316f649b33cee22
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to other PDF files hosted on various domains. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body primarily contains metadata and the list of URLs.

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://lists.accordionapocalypse.com/uploads/1/3/1/4/131413678/131413678.html#poder+derecho+y+clases+sociales+resumen+capitulo+5
    • http://rabidrabs.net/uploads/1/3/0/7/130776578/1060554.pdf
    • http://godfreyforcountycommissioner.com/uploads/1/3/0/3/130379246/dupugitaj-bozuwevilexi.pdf
    • http://zanzibarhope.com/uploads/1/3/0/5/130543212/ab6fc1773db.pdf
    • http://seaofstonesgallery.com/uploads/1/3/0/9/130969231/memigadi.pdf
    • http://eaglecustompaintandbody.com/uploads/1/3/0/9/130969917/52c86a44b5.pdf
    • http://edpaschkeartcenter.com/uploads/1/3/0/8/130814562/buxotogizikedidogena.pdf
    • http://myneighborhooddumptruck.com/uploads/1/3/0/4/130475992/36496bcdd0eb95.pdf
    • http://bullsandcrabs.com/uploads/1/3/0/3/130313179/9249761.pdf
    • http://eplusrenovatie.be/uploads/1/3/0/7/130775306/mubedekupadulefotoza.pdf
    • http://villageofwakanda.com/uploads/1/3/0/8/130814120/zoladiwil.pdf
    • http://thefundamentalistmind.com/uploads/1/3/0/3/130379182/d13750.pdf
    • http://scarthisworld.com/uploads/1/3/0/8/130874526/togidavizemitufowej.pdf
    • http://the-spaceman.com/uploads/1/3/0/9/130969037/zixilif_vabagejex.pdf
    • http://shaohuawu.com/uploads/1/3/1/3/131383900/1bb7e0fd3e36.pdf
    • http://magicalsmells.com/uploads/1/3/0/4/130476587/2376439.pdf
    • http://dev.americameditating.org/uploads/1/3/1/4/131453137/lezisarosifud.pdf
    • http://stuccovenetiano.com/uploads/1/3/0/5/130540046/1090152.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007367.bin
f3663e080e5a86da2212b2ebcad6fd357ec04d92a91df2ecf8834f9f915bbff8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7367 10288 bytes
font_01_sfnt_off000097fb.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97FB 16036 bytes

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