Malicious PDF — malware analysis report

Static analysis result for SHA-256 506605d0cf415225…

MALICIOUS

PDF

92.7 KB Created: 2021-02-25 01:22:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2c91027a3abc6c306fc1a1e8a8663fd4 SHA-1: d2c4ce3771af4ca0c66f6cee96a9de0f0a166076 SHA-256: 506605d0cf4152254f87812291a12cd9628bc2e1b9798230fa3d519608c154e1
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to disposable hosting or redirectors, suggesting a phishing or scam attempt. The primary URL, https://jacksth.ru/strik, is likely intended to deliver a secondary payload or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=what+are+the+signal+words+that+point+to+a+solution+in+this+passage+brainly PDF link annotation
    • http://vamoktin.ru/subaru_pressure_washer_3100_psi_oil_typew8f13.pdfIn PDF document text
    • http://bavedibigilomit.66ghz.com/confused_mr_krabs_template.pdfIn PDF document text
    • https://cdn.sqhk.co/safubuguva/hdxjiQE/how_to_change_screen_time_restrictions_on_iphone.pdfIn PDF document text
    • http://leree6.club/semiologia_porto_7_ediC3A7C3A3oy2auh.pdfIn PDF document text
    • http://fitness1.space/physiologie_de_l_appareil_urinairewbpho.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/inno_v7_cleaver_manualvr5yl.pdfIn PDF document text
    • https://cdn.sqhk.co/molavagew/fhgqjab/table_tennis_score_sheet_excel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497687/normal_5ff2c6334f874.pdfIn PDF document text
    • https://cdn.sqhk.co/munuluxel/bl6jfJN/canon_1dx_mark_iii_release_date.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475729/normal_600d6bed73619.pdfIn PDF document text
    • http://pinerapidsrr.com/witosofifiwakefanodosec4ca2.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/UghFShe/wovikabesinuzanuvo.pdfIn PDF document text
    • http://limons.space/baton_rouge_business_report_top_100_companiesq8fzs.pdfIn PDF document text
    • http://fakaripeti.xyz/istikhara_ki_dua_for_marriage_in_englishfd57u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476941/normal_5fdb5b2010d0d.pdfIn PDF document text
    • http://sipivide.iblogger.org/81712712979.pdfIn PDF document text
    • http://discount50.pro/beauty_salon_special_services_2016cbjgm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kidewidenidoze.rf.gd/amit_goswami_quantum_mechanics.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_off00012e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E06 5568 bytes
SHA-256: f8d5f289769e583823b5c3f2fffb9b0c462b6550dde82e14b7addb37e89b56e6
font_01_sfnt_off00014104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14104 10464 bytes
SHA-256: 0baaf3e0de27ec1fcdb7751e484be90bc7f97ca35d184fe832a867c12b81d075

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