Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5c978d388e57b6…

MALICIOUS

PDF

77.8 KB Created: 2021-05-15 20:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 27bcd47006d4ae7551bd0ebd00f75413 SHA-1: 997718a0a73863623ee7054eaaa900eae6ffeae3 SHA-256: bd5c978d388e57b63cee1272aef7b927ef141dfd02edd362e2a1720c9293ceaa
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://dafemum.ru/strik?utm_term=how+does+sea+bond+denture+adhesive+work'. This indicates the document's primary purpose is to lure the user to a potentially harmful website. The ML classifier also strongly flagged this PDF as malicious, aligning with the ClamAV detection of 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://dafemum.ru/strik?utm_term=how+does+sea+bond+denture+adhesive+work In PDF document text
    • http://xewosaxebojufir.iblogger.org/reziletoragezi.pdfIn PDF document text
    • http://dokakepitizix.medianewsonline.com/tachdjian_ortopedia_pediatrica_gratis.pdfIn PDF document text
    • http://sifisomatexow.sportsontheweb.net/digestive_system_of_human_body_parts_and_functions.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/liguwubore/bellamy_brothers_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b56a7222-2880-475b-80a6-ec5160682e2f/iso_9001_version_2015_lead_auditor_training.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2cf8f42-49fc-432f-b993-489f4380cd5d/55524768553.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/can_auditory_hallucinations_go_away.pdfIn PDF document text
    • http://luregaw.onlinewebshop.net/bimusizuj.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/fadonaxame.pdfIn PDF document text
    • http://vominobig.rf.gd/telugu_calendar_2020_november.pdfIn PDF document text
    • http://kopujujezi.rf.gd/vesepedinedivumuvulaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/78657362203.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/puzilerojokagefolumanadi.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/bonus_register_form_c_format.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/bcbs_texas_timely_filing_guidelines.pdfIn PDF document text
    • http://movoxafaxusuguf.epizy.com/pomoloximavujubaz.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/28322781904.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/handover_report_email.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/34814794129.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/what_are_the_3_factors_that_affect_enzyme_activity.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/blazor_webassembly_app_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/mopepezosaveturuguzox.pdfIn PDF document text
    • http://vakogez.myartsonline.com/cellulite_cervicale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3ad1491-0fad-45a8-bec0-ea25b3e91e81/limites_de_funciones_exponenciales_ejercicios_resueltos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9db9c329-5196-4e9a-b43e-06242a9de6a1/vubesejuvaw.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_off0000f26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26D 5196 bytes
SHA-256: b2d93047deaeaa40f22f8774b36787bbd833a7cd118147ce9c9c2014b001f73c
font_01_sfnt_off00010424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10424 10708 bytes
SHA-256: 1dde5b2fe2ad70bf21f683a2f48339d7c0444da981dc94ef0f9fc5289cbc7819

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