Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd821870c8f628ec…

MALICIOUS

PDF

37.7 KB Created: 2020-04-05 09:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 14d108160e68b18ab61eca1c25c7aef0 SHA-1: c890617796d747808c28ec19171c5e718060edae SHA-256: bd821870c8f628ec1afea412ee0e7a4bbf0d03714d421ac65d19270e9ae7b2ef
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains text related to medical conditions and application versions, but the primary malicious activity appears to be the distribution of links to external content.

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://interactivegamesales.com/uploads/1/3/0/6/130604617/130604617.html#icd+10+code+for+mild+mitral+and+tricuspid+regurgitation
    • http://hedemeisehen.com/uploads/1/3/1/4/131408772/86e9c593fb2.pdf
    • http://astronautomusic.com/uploads/1/3/0/7/130775856/givaseronimamaked.pdf
    • http://floridacollegiatespearfishing.com/uploads/1/3/1/0/131070798/babanivu-zojefiripofo-zofumeber.pdf
    • http://degoat-london.com/uploads/1/3/0/5/130550797/piwife-waseberajine-tefuma-neripiniko.pdf
    • http://lajollalouvre.com/uploads/1/3/1/0/131070124/muporifaboka_sewomozosakomu_badetojaf_pajojadoxaga.pdf
    • http://sanstuticlasses.com/uploads/1/3/0/5/130539229/vekove.pdf
    • http://1wiseparent.com/uploads/1/3/0/6/130621095/rugatarapunew_bexij.pdf
    • http://imagiflight.com/uploads/1/3/1/1/131164013/begugarefow.pdf
    • http://doodleboarding.com/uploads/1/3/0/5/130590477/nuborovafefuka_gatofexalorudi.pdf
    • http://tovproductservices.com/uploads/1/3/0/7/130739309/pesenobi.pdf
    • http://petersenconsultinggroup.com/uploads/1/3/0/7/130738623/6c630a59a65b64.pdf
    • http://internationaldebat.dk/uploads/1/3/0/6/130639285/tafunom-vezure-sijifetam.pdf
    • http://56answers.com/uploads/1/3/0/4/130435876/674084.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_off00006a25.bin
5cde4ac36cf369ead8a89ca4dfbc06c164ed8377ef7dfbafb695a24c08a09f72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A25 7564 bytes

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