Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e2a88e070651e1…

MALICIOUS

PDF

45.4 KB Created: 2020-06-05 07:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97d05856a037873691391fe2a6fdf3ac SHA-1: 1fd5a075b65dffb2fab70203ba6e39c756ac4adf SHA-256: 18e2a88e070651e1f4e1623afa2bbabc441cb44cb196281d10b807ebe9e6e96c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many of which are dynamically generated and point to PDF files, suggesting a link farm or SEO spam campaign. The document body text, though partially corrupted, includes the phrase 'Calculadora de ecuaciones exponenciales' and references wkhtmltopdf, indicating a potential lure to a fake calculator page. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://at87rer.butterfly520.com/uploads/1/3/0/6/130604379/130604379.html#calculadora+de+ecuaciones+exponenciales
    • http://ns.literacyandbeyond.org/uploads/1/3/0/6/130640010/gimasevajuwur.pdf
    • http://waybackmachineco.com/uploads/1/3/0/8/130874364/953a152fa86a.pdf
    • http://5r65d7.bdgct.com/uploads/1/3/0/6/130621376/dupazorigam.pdf
    • http://starrtreatments.com/uploads/1/3/1/0/131070710/zopojakomawikurot.pdf
    • http://trueknowledgebeats.com/uploads/1/3/0/4/130476885/2592339.pdf
    • http://impresioninmediata.com/uploads/1/3/0/9/130969862/7995066.pdf
    • http://teamforwin.com/uploads/1/3/0/5/130590477/2002446.pdf
    • http://canna-biz.cz/uploads/1/3/0/5/130590374/wiset-meludejewizibu.pdf
    • http://movelikematt.com/uploads/1/3/0/3/130324119/bijeg.pdf
    • http://casadovovorecantodovovo.net/uploads/1/3/1/6/131606624/3071246.pdf
    • http://naturalmentelibertad.com/uploads/1/3/1/4/131483143/juxewugavi-pulafek.pdf
    • http://zoyamoda.com/uploads/1/3/0/5/130550921/2234821.pdf
    • http://lafayetteho.net/uploads/1/3/0/2/130272242/kukenu.pdf
    • http://at87rer.butterfly520.com/uploads/1/3/0/6/130604379/terms.html
    • http://at87rer.butterfly520.com/uploads/1/3/0/6/130604379/dmca.html
    • http://at87rer.butterfly520.com/uploads/1/3/0/6/130604379/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://nofedexof.files.wordpress.com/2020/06/xekixikaramiradegufafawav.pdf
    • https://kudosemuzuna.files.wordpress.com/2020/06/64841471928.pdf
    • https://jelazumadako.files.wordpress.com/2020/06/12044558093.pdf
    • https://rorawet.files.wordpress.com/2020/06/rusiki.pdf
    • https://nuralezunawo436861297.files.wordpress.com/2020/06/72937159134.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b20.bin
cf4d8aa2fae57da3d50f15b3b27bbc8a0f0d5f448a391aaae6408f0aceaab673		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B20 11744 bytes
font_01_sfnt_off0000923f.bin
c0982807324681c2194e80f3f637ca3700f5bf2c32718b44bdc390b4bb628087		 pdf-font-stream PDF embedded font (sfnt) at offset 0x923F 16080 bytes

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