Malicious PDF — malware analysis report

Static analysis result for SHA-256 efbe03e7f2e0062f…

MALICIOUS

PDF

83.4 KB Created: 2021-03-27 12:46:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 71db3e974654aa8a3f4be8376f410e9a SHA-1: 9f97086e4cb80e0f3ea63f99634ff6bd01a0537e SHA-256: efbe03e7f2e0062ff9f6e79fe46732098ddef6867ecbfb2db4bc09ada263c7f3
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of the external URI and the nature of the heuristics suggest the document is designed to redirect users to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://fokemale.ru/strik?utm_term=jbl+flip+2+bluetooth+speaker+price+in+india PDF link annotation
    • http://tunewejewuz.mypressonline.com/wamidelijesejububix.pdfIn PDF document text
    • http://dulisakip.medianewsonline.com/57367679473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503533/normal_6018e7fb60cd8.pdfIn PDF document text
    • http://dusibarupuguli.medianewsonline.com/i_would_always_rather_be_happy_than_dignified_traduzione.pdfIn PDF document text
    • https://ridejotewofo.weebly.com/uploads/1/3/5/3/135314456/wakigedo.pdfIn PDF document text
    • http://kawafopi.mygamesonline.org/zewiwulejolaniba.pdfIn PDF document text
    • https://jelimofinumalo.weebly.com/uploads/1/3/4/6/134669039/wajopemi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383304/normal_6005f4f389e3a.pdfIn PDF document text
    • https://suridivulav.weebly.com/uploads/1/3/5/3/135312357/lapinadezegu.pdfIn PDF document text
    • http://betijeduw.getenjoyment.net/fukixaxu.pdfIn PDF document text
    • http://taxokijoba.sportsontheweb.net/wojovewusupopugedo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413110/normal_604add3022d01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425504/normal_6021f88417d87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422658/normal_60385bcb82bac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/65408126382.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/dragon_age_origins_mods_pc_free_download.pdfIn PDF document text
    • http://binuwuzipu.myartsonline.com/vowatikawi.pdfIn PDF document text
    • http://varirojemixu.myartsonline.com/98544748169.pdfIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/29993766862.pdfIn PDF document text
    • http://nowimirozox.atwebpages.com/mail_server_configuration_in_linux_step_by_step.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/libro_agorafobia.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_off000108b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B9 5568 bytes
SHA-256: 088e20927a139419635e3e99ef5a9770db420179e25769c9f4256a3deddd1e25
font_01_sfnt_off00011b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9A 10708 bytes
SHA-256: fc905042ca31d8dc902f00caa204f7b6c713fcc133c30a001ea070d6e3449817

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