Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b773c1dcea2c81…

MALICIOUS

PDF

105.4 KB Created: 2021-04-27 07:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 91c691aee97ca45697072b93c663b8b0 SHA-1: 697fa8e97bb6a4091fadecd67d6074928d243873 SHA-256: c8b773c1dcea2c81f0113dc53419e8c3d36814389a7abdc9bc471363893e9526
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The embedded URL 'https://ponafet.ru/strik?utm_term=what+setting+is+curse+of+strahd' indicates a lure related to a popular game, likely to attract clicks. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://ponafet.ru/strik?utm_term=what+setting+is+curse+of+strahd PDF link annotation
    • http://malanefire.sportsontheweb.net/automatismos_electricos_neumaticos_e_hidraulicos_paraninfo.pdfIn PDF document text
    • http://pumujavebedopa.iblogger.org/career_path_sample.pdfIn PDF document text
    • http://motorutovibipe.sportsontheweb.net/acidosis_metabolica_signos_y_sintomas.pdfIn PDF document text
    • http://laribij.scienceontheweb.net/ridexejuderoturunaguza.pdfIn PDF document text
    • http://gasurorir.sportsontheweb.net/mubip.pdfIn PDF document text
    • http://badamow.iblogger.org/15590873779.pdfIn PDF document text
    • http://bekopomulasebi.getenjoyment.net/rasobifuwoxazovivisagu.pdfIn PDF document text
    • http://lidagap.22web.org/sql_server_management_studio_2020_r2_user_guide.pdfIn PDF document text
    • http://dorususab.iblogger.org/haier_8000_btu_window_air_conditioner_reviews.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_c680a9c516c345d2ad1d92b6c867e88d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b552c147-3560-400f-ba16-def50f5290b6/james_allen_reviews_the_knot.pdfIn PDF document text
    • http://jejazakegaxanub.rf.gd/similarities_between_transformational_leadership_and_transactional_leadership.pdfIn PDF document text
    • http://nabikelotedabe.epizy.com/kigegidoximibamokeje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdc5bb04-099d-4717-8196-3863b8d2173f/how_to_setup_powerflex_525.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5519098a-ba25-4a41-99e8-5f81fa84789a/69117004254.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6ad5742-ed8a-477f-8ad1-32935cb0ce93/vuzakevaxinopidusal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec14270a-d87d-4e7b-8661-dda78f214a38/womawimu.pdfIn PDF document text
    • http://goguvero.epizy.com/mxico_creo_en_ti_manuel_bernal_letra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b479bef-c2c8-4e17-af74-fb0ad897bdcd/jipazabuzixek.pdfIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_8abc28b76ebf49bd830ba00e1a812f30.pdf?index=trueIn PDF document text
    • http://tomuvonunilo.epizy.com/biblia_reina_valera_actualizada.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_off00015f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F1F 5264 bytes
SHA-256: 06473c634e97e05d280e54280c326a612cb45d1914ef3532b37a3ade60b14d43
font_01_sfnt_off00017110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17110 11188 bytes
SHA-256: 860bc54c43af1b850d20b709e698c3733b87b6ff468d91762c9a267ec87cc16a