Malicious PDF — malware analysis report

Static analysis result for SHA-256 de381d2293d57e1b…

MALICIOUS

PDF

148.3 KB Created: 2021-03-14 18:12:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 2aa18689772d0e9c07b44e3ea1fcd98a SHA-1: ee3332d9e1b1a1f3272a924b64759ba6fff0664b SHA-256: de381d2293d57e1b52d1824f52b36bc85386980f64d8970fd2b473e319e59997
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on disposable or link-farm-like services. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of creating small PDFs that act as link farms on disposable hosting. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/wix?keyword=madison+%25231+school+calendar PDF link annotation
    • https://nilazarokidimud.weebly.com/uploads/1/3/4/4/134495838/e35287ec58819.pdfIn PDF document text
    • https://jizuxiragoleti.weebly.com/uploads/1/3/4/6/134639642/zavow_fekivoxalin_ruxubawunetet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498868/normal_5ff3891def68d.pdfIn PDF document text
    • http://vzale.ru/download_ucraft_free_apk_whatsappfumby.pdfIn PDF document text
    • http://e-devletodeme.net/ap_seminar_iwa_research_questions_2020d0qn5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407576/normal_60281cfc1985c.pdfIn PDF document text
    • http://toppiksnack.xyz/firibosasjc1k9.pdfIn PDF document text
    • https://mipikarekegimo.weebly.com/uploads/1/3/1/6/131606279/tesaf_wixasaxo_jiwav.pdfIn PDF document text
    • http://stavki-na-sport.site/kelofetiza5mx8l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481552/normal_60113d251c8f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463266/normal_5fd68bc156b5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448718/normal_60084b33a4499.pdfIn PDF document text
    • http://insta-sale.site/jikevumufisazijpj.pdfIn PDF document text
    • https://zokexeti.weebly.com/uploads/1/3/5/9/135966989/gedirefinanuw-salukutazuwiva.pdfIn PDF document text
    • https://zugimawaxudal.weebly.com/uploads/1/3/1/4/131410952/kujeradaje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bf1748f-bd06-42d3-a2bc-acde8bd6e3cc/pijixe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f383fd4-fed2-4eb3-b100-f57f8b650cdf/folewugobujuzumupuvupimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c471b880-3cb8-476d-99f2-8b5edc43f5c0/lesisizabiladokor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bf0743f-b350-4f50-8a9d-2693ed66bd55/english_grammar_practice_online_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/857a64d7-e6c3-4ea8-a3e5-1f9c1d117a73/60152393746.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51a3dec5-fd5b-470b-a918-8ed4b9e0d047/55728515141.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bc26b53-edae-4853-9361-d524d0f57526/5645792986.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_off0002097e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2097E 4692 bytes
SHA-256: b602d8f29b53efd4786ae39837076459f5698520ba98804cf27d1a7d666bd545
font_01_sfnt_off00021985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21985 12944 bytes
SHA-256: 22c2f1d2cb068d823750ae496dd15948825d5cd5ed36c10a6a0eac99f22899b1