Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf7ed16360ae16d…

MALICIOUS

PDF

79.0 KB Created: 2021-04-04 20:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5ae6acecb9b35dd6c7f7e62f6a7dc406 SHA-1: 61697baad7f2e073557d1c48fa6549d3ad9c395b SHA-256: 4cf7ed16360ae16d283899db6b335e6909a3113934db487272cea6bba73b2a4e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm configuration, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://zajinet.ru/strik?utm_term=evh+5150+iii+el34+50+watt+manual PDF link annotation
    • http://secureappeal.com/oral-b_smart_5000_electric_toothbrush_reviewrmer5.pdfIn PDF document text
    • http://complerbnp.com/corporate_design_mockup_templatemmnvw.pdfIn PDF document text
    • http://bottlechainworld.com/682863317634cit5.pdfIn PDF document text
    • http://service-hire.com/90213602394oujgx.pdfIn PDF document text
    • http://muwiduvepobuz.mygamesonline.org/bureaucracy_management_theory.pdfIn PDF document text
    • http://rodina38.ru/jojexuvusenenalafolini1y2vx.pdfIn PDF document text
    • http://support-copyrighthelpservice-about.com/57852955987j6t7f.pdfIn PDF document text
    • http://revershjtb.site/kewefemelikefaribimimap68okq.pdfIn PDF document text
    • http://wirobigi.medianewsonline.com/55895492989.pdfIn PDF document text
    • http://proita.fun/ktm_repair_manual_2017q2dex.pdfIn PDF document text
    • http://duzusedolatepe.mypressonline.com/16249749501.pdfIn PDF document text
    • http://tuzevijubozor.mywebcommunity.org/18719688170.pdfIn PDF document text
    • http://kafofal.mygamesonline.org/maths_skills_for_a_level_biology_aqa.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/cfc0e5b5-2123-43b8-9cfd-984353adb646/66493974757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/993fb69e-e84b-437b-931f-d88f048a72ff/99475232603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb821300-26c8-4973-b807-fa188c19f6b3/how_to_get_business_startup_loan_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27270f8d-d509-4eb2-b02a-7c23347bab36/81545647892.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e6bbd59-66e4-40c9-a5e3-89ad2142bbff/second_hand_two_way_radios_for_sale_cape_town.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/3356046783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3229ae46-7a5b-4ae2-a389-7359739f1f48/heirs_of_the_founders_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23331cde-92fe-480d-a83d-0cd65ce9ac9c/ziximegavijuzokatut.pdfIn PDF document text
    • http://lugimeviguv.myartsonline.com/qcm_anatomie_du_coeur.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_off0000f1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AE 5328 bytes
SHA-256: d8f788f097ce795876f87b37dd0f255c1f086bea22883457bb1e276d75f64af6
font_01_sfnt_off000103d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D8 12080 bytes
SHA-256: 0b3461882df1e2ba6f056a1605e753562485117bc3b7840ac501156940c91b58

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