Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf951e359a60c63…

MALICIOUS

PDF

79.4 KB Created: 2021-03-19 04:22:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: eabe6c0189ae5c8273198c7293f39984 SHA-1: d2054218546809352fc065320d13fb185910bfda SHA-256: 9bf951e359a60c63d7f724476fdd7019e01f845add9b9d472f72c3bac3247d6c
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains and potentially used for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the phishing or distribution vector.

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://zajinet.ru/aws?utm_term=mr+heater+big+buddy+dimensions PDF link annotation
    • http://surulefej.iblogger.org/83684826924.pdfIn PDF document text
    • https://xitarowax.weebly.com/uploads/1/3/2/6/132681505/5456528.pdfIn PDF document text
    • https://cdn.sqhk.co/gizoxemovefi/nPijiaS/tobagejaxiruram.pdfIn PDF document text
    • http://walletelectrum.buzz/22668491900ri4i.pdfIn PDF document text
    • https://fobinoxibenor.weebly.com/uploads/1/3/1/4/131437242/dutovididire_tipijesavu.pdfIn PDF document text
    • http://emirofficialzm.com/davaserogie2kj5.pdfIn PDF document text
    • http://chempion.coffee/natural_dyes_and_pigments0ktt3.pdfIn PDF document text
    • https://jevalibiku.weebly.com/uploads/1/3/4/2/134266190/pegim.pdfIn PDF document text
    • https://wexivupesowapab.weebly.com/uploads/1/3/2/7/132712225/xibowokezokolefovo.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/iLgez6f/karepolovavajag.pdfIn PDF document text
    • http://awpmode.com/68622021264iv326.pdfIn PDF document text
    • http://lugogojeradipax.22web.org/antioxidantes_en_alimentos_y_salud_libro.pdfIn PDF document text
    • https://cdn.sqhk.co/bozadukopufu/UhdyENe/plague_doctor_mask_leather_template.pdfIn PDF document text
    • http://filemarker.store/diaper_genie_complete_walmart9zhpz.pdfIn PDF document text
    • http://apsmall.space/windows_xp_professional_x64_edition_product_key_generator82c1b.pdfIn PDF document text
    • http://alifan.store/kujevijoxomuzutaxunihup9b.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/h5Q3YCX/business_process_management_organization_structure.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wupotolirenenar.epizy.com/tefogu.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/zuragupofa.pdfIn PDF document text
    • http://kirigawegugava.epizy.com/febulidijogaxupibop.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/facebook_messages_history.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_off0000f4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 5452 bytes
SHA-256: 37cfa2a510fc4eb18004399c35176dca9ab506f6f706db9236bf83332bd13024
font_01_sfnt_off0001071e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071E 11796 bytes
SHA-256: 9d05fe408e50925e565f1cecce97d71c28b01df4e2cdf7b7c2b3c5777d2cdf37

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