Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecdce32eaf9d7f61…

MALICIOUS

PDF

79.7 KB Created: 2021-03-27 16:07:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e722302df4b33f6bacf93051f28591fa SHA-1: 2e27461d7e590e418669a310884b88118194a27c SHA-256: ecdce32eaf9d7f611a1901a6a83c88a16333912fa45413c59d5046d34aa61af2
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 pointing to disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jacksth.ru/strik?utm_term=how+to+decide+between+interview+candidates PDF link annotation
    • http://podarokinsta24.online/widuluvawazapewowuvuh0npk.pdfIn PDF document text
    • http://frontend-developer-azaynullin.site/column_chart_template_google_docsxjnmf.pdfIn PDF document text
    • http://consumer-data-protection-bureau.com/what_type_of_transmission_fluid_does_a_2005_honda_accord_takesjqe6.pdfIn PDF document text
    • http://supportcopyright.net/download_game_slendrina_the_school_mod_apkn4s0m.pdfIn PDF document text
    • http://italia-doc.space/xugajipesaxaboduwulfnz3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_30b3072066a44531a765fa6f1a7e6394.pdf?index=trueIn PDF document text
    • http://modewomidoxiva.epizy.com/jogizodola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c91fc208-fb6d-475f-a09e-6b7dc99f05e7/13002316506.pdfIn PDF document text
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_0ee4e747c1e445c0989bd72d3dfc767e.pdf?index=trueIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_a59b9e5544614ba9b90bb6c7756cff22.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0036b048-aad4-4b39-af7f-0234275585ad/77560678155.pdfIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_640e0a1daf6c4f2a9c9c521612b2b984.pdf?index=trueIn PDF document text
    • https://7211abc3-b26e-437e-abd8-8a8c7ebd4af5.filesusr.com/ugd/0683fb_7a7641bbede04cfe873815e912b19f1f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1da14664-774e-44bc-87af-441c0673897b/12990676947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32ab1fe5-db8c-4349-8ba1-724e199611e1/83918981813.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d04aee49-fe0b-4b67-ae97-a6b1b7c30bef/samsung_model_un46b6000vfxza.pdfIn PDF document text
    • http://kisolapuri.rf.gd/curso_de_ingles_gratis.pdfIn PDF document text
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_54e2c4399b054bde87a3a810e1f13f4a.pdf?index=trueIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_b9155f13d22040dc8769ef698a1f6650.pdf?index=trueIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_f8a7eadf5add498d9f8f947611e22e78.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_off0000fb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB74 5156 bytes
SHA-256: f1307cdb50ae51d885433f24418f4608cd2ff6ceb5b67bd5b0cac358a1337747
font_01_sfnt_off00010d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1C 10624 bytes
SHA-256: 1ed98fec944618b7f7f54f1994dd95d905512abcbb73e9670e0c9292ec3c2c89