Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4d7ded06cb49f0…

MALICIOUS

PDF

91.6 KB Created: 2021-04-15 01:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 836fc038398381a96f4eedea058d81dc SHA-1: dfcac2e5bfd61924b848360897a58d9b1d8b4fbb SHA-256: 9e4d7ded06cb49f007ae538d0d0a139dc6dac5add448884cc2ac9ff46f48223e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The ML classifier also strongly indicates maliciousness. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://pelibifir.ru/strik?utm_term=mercury+black+max+150+performance+parts PDF link annotation
    • http://weinmvc.net/velazuwuwzo2se.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473044/normal_60352b440a2d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458428/normal_5fe6719dc3571.pdfIn PDF document text
    • http://yourcy.com/twilight_saga_2008_full_movie_in_hindi_download_filmyzillav62ol.pdfIn PDF document text
    • http://kelnoteres.xyz/841120906160uvt8.pdfIn PDF document text
    • http://gigezojiradof.scienceontheweb.net/swarm_intelligence_bonabeau.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/maya_angelou_quotes_about_life_lessons.pdfIn PDF document text
    • http://ponemofetu.scienceontheweb.net/filisuvemikojozinuwof.pdfIn PDF document text
    • http://kofodotig.sportsontheweb.net/dexibev.pdfIn PDF document text
    • http://titanovyi-filtr.ru/modern_biology_textbook_answersnlycm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452199/normal_606e3a129777d.pdfIn PDF document text
    • http://sumigemag.mywebcommunity.org/81691030197.pdfIn PDF document text
    • http://mjawebdesign.net/85777269628aflq5.pdfIn PDF document text
    • http://kexedeziferu.sportsontheweb.net/benefits_of_reading_essay.pdfIn PDF document text
    • http://lizowaw.scienceontheweb.net/rafoziwexepu.pdfIn PDF document text
    • http://nomiwiturej.getenjoyment.net/39713171373.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/a62ceea6-f3c6-4e34-b329-7c6d7f1a5269/sebuzinadinufamuvubiputox.pdfIn PDF document text
    • http://moxapowi.myartsonline.com/new_blob_response_type_application.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b34c5103-9ff0-40c0-909d-2f9ce3875626/15681992199.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aa97ea8-9a20-4081-bc9b-613852e800de/test_for_following_directions.pdfIn PDF document text
    • http://vexolofifete.atwebpages.com/maths_worksheet_for_class_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf9b488e-708a-4bcf-bb50-90c6ba2ae955/weapons_of_math_destruction_chapter_4_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52f5bce4-8dc7-4971-a313-6fddea5ccd0c/87064981422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce0d9790-ec02-4a00-990c-5f4940542ed8/tupadipunuriwamidufugeri.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECA 5856 bytes
SHA-256: 5fa53166e11ca33709470a446ea70f430316cdb77ff0603f6143bce15a89e339
font_01_sfnt_off000122c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C9 12196 bytes
SHA-256: 5d912b6b580f2734b2319e09dad3e82c6dc16d2d2a3055788d6d487aa960c759
font_02_sfnt_off00014b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B16 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd