Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e1aeff9cef1318…

MALICIOUS

PDF

75.5 KB Created: 2021-04-03 04:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: bbb06f508b60c85e441e5bd60b5b6d82 SHA-1: 06f7a3a983fcd57cf41ceca87c9df0a3096238ae SHA-256: 28e1aeff9cef1318e0db0bbbec0c3cf28ea6d03f7c8b05a42cee96084e898001
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, disguised as a character sheet, which is a common lure for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs, including a link farm on disposable hosting, supports this assessment. No scripts were extracted, but the document's structure and embedded links suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://vilenefex.ru/123?utm_term=vampire+5e+character+sheet+fillable PDF link annotation
    • http://zonitupupafof.sportsontheweb.net/suvolajisabogudaz.pdfIn PDF document text
    • https://tibilizam.weebly.com/uploads/1/3/0/7/130775373/215b0c.pdfIn PDF document text
    • http://bivitajuteje.mypressonline.com/career_paths_medical_gratis.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/fifil.pdfIn PDF document text
    • http://kajejib.medianewsonline.com/rivonomuxanigevivi.pdfIn PDF document text
    • https://pavovebowejimop.weebly.com/uploads/1/3/1/6/131607108/2733281.pdfIn PDF document text
    • https://lewofadexireg.weebly.com/uploads/1/3/4/8/134868993/094f62da7452.pdfIn PDF document text
    • http://komozazene.getenjoyment.net/advanced_java_syllabus_gtu.pdfIn PDF document text
    • http://suzofovolavuk.scienceontheweb.net/viwowofewekojoforofur.pdfIn PDF document text
    • https://vajunepiw.weebly.com/uploads/1/3/2/6/132681590/xuvoluzonitoloz.pdfIn PDF document text
    • http://fejiximodanu.mygamesonline.org/antioxidantes_en_alimentos_y_salud.pdfIn PDF document text
    • http://gabibaz.22web.org/50134542745.pdfIn PDF document text
    • https://gejodawutu.weebly.com/uploads/1/3/1/1/131164152/siresarew.pdfIn PDF document text
    • http://damewonuseba.sportsontheweb.net/bet_surface_area_measurement.pdfIn PDF document text
    • http://duvejajenivogik.getenjoyment.net/vertebrate_paleontology_and_evolution_carroll.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sujuletabekomus.rf.gd/88715011538.pdfIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_97f673c601984dd18ef27839d938f2be.pdf?index=trueIn PDF document text
    • http://degevojorak.myartsonline.com/18533423747.pdfIn PDF document text
    • https://d7e981a8-8c4a-445e-aef0-60d3d4911bd2.filesusr.com/ugd/65d69c_2cc87f13dec9454bb83341004395cec9.pdf?index=trueIn PDF document text
    • http://jonesojawu.myartsonline.com/spoorboekje_bouwbesluit_2020.pdfIn PDF document text
    • http://bejanifezilo.atwebpages.com/archicad_19_keyboard_shortcuts.pdfIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_e91135b44c644b7a9e9b36bd0c9a82b8.pdf?index=trueIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_6f17ab2e6a9f4a96aa131cd9009ab349.pdf?index=trueIn 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_off0000e9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AD 5484 bytes
SHA-256: d4524b7fb1603ca63b37f838b49fc99937b0278a57f7959d88f2cef4db5caf4d
font_01_sfnt_off0000fc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC34 10680 bytes
SHA-256: 3a8898a5ad716bc21509eb59d8703fbcbbce8f91101dea9e3bab84a5643573b4

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