Malicious PDF — malware analysis report

Static analysis result for SHA-256 82434e7dd14b10c8…

MALICIOUS

PDF

64.6 KB Created: 2020-03-10 03:14:17 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a163d737413da3cf03ff627c1dfd5747 SHA-1: 3fa3141ad376af70bbf279a848363685452e4a6f SHA-256: 82434e7dd14b10c8a5e1795e5f8271120bdbd8e8830fb9cf799a810808096be6
96 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary URL, http://djspizza1.com/uploads/1/3/0/2/130272415/130272415.html#joint+probability+mass+function+variance, is among these links. The document body contains obfuscated text and references to the wkhtmltopdf tool, suggesting it was generated programmatically. The extensive linking pattern indicates a likely attempt at SEO manipulation or directing users to potentially malicious content hosted on numerous domains.

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://djspizza1.com/uploads/1/3/0/2/130272415/130272415.html#joint+probability+mass+function+variance
    • http://www.tashaeakin.com/uploads/1/3/0/4/130483650/pusejige_rixiborilebizeg_komawilugalavos_rejiku.pdf
    • http://www.betherepetsitting.com/uploads/1/3/0/4/130475994/zoxibametexoseke.pdf
    • http://beyondbeautymedical.com/uploads/1/3/0/4/130489833/5159074.pdf
    • http://meliciosa.com/uploads/1/3/0/5/130539437/natofugajujun.pdf
    • http://dribblefast.com/uploads/1/3/0/5/130551065/e5da8.pdf
    • http://myhappyeverydaylife.com/uploads/1/3/0/6/130621805/bisel-ginizujogekelis-vowalulot-jitevod.pdf
    • http://gadgetgrump.com/uploads/1/3/0/7/130776790/jinuvizejesozibesebo.pdf
    • http://essusask.ca/uploads/1/3/0/4/130483842/lunoxeposikad.pdf
    • http://rollingoaksmemorialcenter.org/uploads/1/3/0/4/130489080/siromizolomuv_jalasew_birovikerove.pdf
    • http://www.natalieboden.com/uploads/1/3/0/6/130605135/ebd5c010ae8c.pdf
    • http://moonandstone108.com/uploads/1/3/0/9/130969701/e51b1ca8.pdf
    • http://adogenixptyltd.net/uploads/1/3/0/4/130475921/686213.pdf
    • http://wakenaveiaboats.com.br/uploads/1/3/0/7/130776895/fixakagipiroj-tukadelojogenu-bofenug.pdf
    • http://michaelroberto.net/uploads/1/3/0/6/130605278/mibupagebumeva.pdf
    • http://overpochsmostwanted.com/uploads/1/3/0/7/130739828/9484074.pdf
    • http://shanganspa.com/uploads/1/3/0/4/130483540/buxegaj_tuwuberati_sebutub.pdf
    • http://www.gced-insights.com/uploads/1/3/0/5/130588905/kozifax.pdf
    • http://newnextsf.com/uploads/1/3/0/5/130539053/4034623.pdf
    • http://www.madisontrees.com/uploads/1/3/0/6/130620924/gesenowi-foxuxa-piduvowim-bogaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000affc.bin
358360a33aa0837c8a20563a1bbb1a2e81889404c767ea4bb6b513e43ed29f53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFC 9116 bytes
font_01_sfnt_off0000d2cb.bin
ba105120d445750b64542ee7733ce6ff7c35fca51105096c33ade14ec2188735		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CB 3200 bytes
font_02_sfnt_off0000de11.bin
c6c46516e3c37eb24c7b6cc0f1993e364259d9b3b35a45522360239d1a69365f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE11 16268 bytes

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