Malicious PDF — malware analysis report

Static analysis result for SHA-256 99342e15c0688424…

MALICIOUS

PDF

71.0 KB Created: 2021-03-10 13:53:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f41732a94a0d6d6def0507f3d90d8862 SHA-1: 60e7f9bcdb006a46739e4ae6308ee3d65cb6bdf5 SHA-256: 99342e15c0688424972fce04abe8ac435a48046abbdc359ee4299b877846d29d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains keywords related to educational worksheets, likely serving as a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 https://botokaw.ru/award?keyword=subject+verb+agreement+worksheets+3rd+grade+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427293/normal_600dcdad085bf.pdfIn PDF document text
    • https://vagewojevibo.weebly.com/uploads/1/3/4/8/134873572/64ea9c78e753c05.pdfIn PDF document text
    • https://zofazozudu.weebly.com/uploads/1/3/0/7/130739697/401d68e6d964a.pdfIn PDF document text
    • https://laregupofonel.weebly.com/uploads/1/3/4/4/134464195/rurikumomobu.pdfIn PDF document text
    • https://bexunofa.weebly.com/uploads/1/3/4/7/134721512/223d2650a7.pdfIn PDF document text
    • http://tepifugamokeg.medianewsonline.com/statistical_models_and_methods_for_lifetime_data.pdfIn PDF document text
    • http://jerevuxo.iblogger.org/zazogilonubotur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425515/normal_60450d4393ec7.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/22952052468.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462066/normal_5ff7bfa6a8fb1.pdfIn PDF document text
    • http://suzofovolavuk.scienceontheweb.net/tojirisubenedizoji.pdfIn PDF document text
    • http://fisujerekuvij.getenjoyment.net/sezadikupuz.pdfIn PDF document text
    • http://wedipum.mygamesonline.org/how_to_fix_no_icons_on_desktop_windows_10.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/how_to_get_fl_studio_cheaper.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/uglys_electrical_references_2020_edition_6th_edition.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/29387733365.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://worizekadi.epizy.com/environmental_impact_and_risk_assessment.pdfIn PDF document text
    • http://dovunufesesiz.onlinewebshop.net/python_gui_programming_cookbook_code.pdfIn PDF document text
    • http://kivozusemu.atwebpages.com/kosologesesef.pdfIn PDF document text
    • http://koriwironawuva.myartsonline.com/65878224592.pdfIn PDF document text
    • http://medazupu.onlinewebshop.net/win_10_keyboard_shortcuts_settings.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD674 6236 bytes
SHA-256: d419332df2e60955b9f0a4a7e5c9797f0aa1a593e5d88ece30af9217b0c2a4cc
font_01_sfnt_off0000eb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB99 10272 bytes
SHA-256: 9daf7f95b8ffe1e33af5fc3472f0ffe5734fa11b517d1762d5a7225e2612ebc6

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