Malicious PDF — malware analysis report

Static analysis result for SHA-256 67e29828bb9f8107…

MALICIOUS

PDF

35.2 KB Created: 2020-05-16 04:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e9b1c05182d3eaa0bfc334f68b8dffe SHA-1: fb152f510f46961361ff4bc8bd97092d406e7396 SHA-256: 67e29828bb9f81076fd0aed3c33461517123c9c7ed4098d21ceca92262b2e9df
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains numerous embedded URLs and a heuristic firing for a browser extension installation lure, indicating a social engineering attempt to prompt the user to install malicious software. The ML classifier strongly flagged this PDF as malicious, and the presence of many external links suggests a link farm or redirection mechanism. No scripts were extracted from this sample, but the overall pattern points to a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://chinoxx.com/uploads/1/3/0/7/130739188/130739188.html#greek+and+latin+roots+worksheet+high+school
    • http://allliftcranetrucksptyltd.com/uploads/1/3/0/2/130288456/masulabipe.pdf
    • http://campobelloislandguide.com/uploads/1/3/0/7/130740200/da6d71f9583a860.pdf
    • http://chickswithdips.com/uploads/1/3/1/3/131398288/lakamutojewapawina.pdf
    • http://roxzumba.com/uploads/1/3/0/6/130604018/felozabevi.pdf
    • http://adnpkids-researchfoundation.org/uploads/1/3/0/8/130874264/364ce10ecd79bb.pdf
    • http://blossomandwren.com/uploads/1/3/0/4/130436121/wugole_sijobisidaget_vuwesun_fideju.pdf
    • http://wheretocut.com/uploads/1/3/0/9/130969231/jekawo.pdf
    • http://fletchertavern.com/uploads/1/3/0/7/130739423/kamojexexoretak_lanimug_velalusojafo_dulizi.pdf
    • http://momandpopeshop.com/uploads/1/3/0/6/130620792/39face413ec7a6a.pdf
    • http://tricitytaxi.net/uploads/1/3/1/6/131637255/suzexebizimalerex.pdf
    • http://pedroslawncare.net/uploads/1/3/1/8/131856937/rujezir.pdf
    • http://northwestoksurvivalswim.com/uploads/1/3/1/6/131606133/mimufojolugatapan.pdf
    • http://truepixelphoto.com/uploads/1/3/0/6/130639557/fofob_sifixuj.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e64.bin
5fdbdf77c46cfacf4d6a174f89362e98fb03450174b8f7ec6794f1f71b0ba099		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E64 10276 bytes

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