Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c64f939a38897a…

MALICIOUS

PDF

79.0 KB Created: 2021-02-24 01:46:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: ef2ce3043bfa48e87962e178efb24fef SHA-1: 23aa88e41417ecaab70c77704661de9d83b8ea08 SHA-256: b4c64f939a38897ac48949293c7032163ebb4554484da1569c1ebbd1008a946f
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm on disposable hosting. The embedded URLs, such as 'https://baarspo.ru/strik?utm_term=zmodo+model+zp-nl18+manual', suggest a phishing or credential harvesting attempt by luring users to potentially malicious websites. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely involving JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/strik?utm_term=zmodo+model+zp-nl18+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450507/normal_5fe3d953493a3.pdfIn PDF document text
    • http://copyrightreports.com/kuzetoxv9e4s.pdfIn PDF document text
    • https://cdn.sqhk.co/diratukuz/Vj68pii/top_cool_ringtones_2019_english.pdfIn PDF document text
    • https://cdn.sqhk.co/vopunokapire/ecEvjb4/what_is_the_business_definition_of_employee_retention.pdfIn PDF document text
    • http://kismyketio.com/cytek_aurora_user_manualsaayw.pdfIn PDF document text
    • http://walletelectrum.buzz/34676660199b2ws3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489041/normal_5fda83d486286.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366041/normal_60003cd745d17.pdfIn PDF document text
    • https://cdn.sqhk.co/vukupamita/AQ2Ujjd/39980269819.pdfIn PDF document text
    • http://italywow.pro/video_from_facebook_ads_managerqoihp.pdfIn PDF document text
    • https://cdn.sqhk.co/mezugifosa/hchfidV/33775810189.pdfIn PDF document text
    • https://cdn.sqhk.co/difanemifal/Uicjeha/bareleri.pdfIn PDF document text
    • http://cashtanks.fun/18415967890lo421.pdfIn PDF document text
    • http://mybiol.site/oscar_health_plan_contact_numberdp4mj.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/haBehhj/world_of_kings_class_tier_list_3._0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499285/normal_5ff4cc8c50503.pdfIn PDF document text
    • http://lifeit.pro/tuzedakorapuvk0g6a.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/bawalidamovidud/hallelujah_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/macos_catalina_10._15._b5.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/wasilanes.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/nitin.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_off0000fa2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2A 5116 bytes
SHA-256: 51384ba631796e3288d301e28b7ac89a836890800d5ede6646d23537208b6e86
font_01_sfnt_off00010b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B92 10304 bytes
SHA-256: 760f80d54c64df3e8f3c385ecbceecd327ba771a2ca8ea7ba653cd63311e4287

Open this report in the interactive analyzer, or submit your own file for analysis.