Malicious PDF — malware analysis report

Static analysis result for SHA-256 4904a723d4c6fe65…

MALICIOUS

PDF

73.7 KB Created: 2021-03-22 10:38:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 37327aa8de31873b618ac9d0ef065bab SHA-1: 5625c0157b2dc11e8767b3711c60743d69751134 SHA-256: 4904a723d4c6fe65033756becddf2ebbc3cff718cf7fd445dbcc014211d2e7e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://crophysi.ru/wix?keyword=prebles+artforms+11th+edition+chapter+17+pdf PDF link annotation
    • http://jotijitod.66ghz.com/australian_commercial_invoice_template.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/business_management_skills_notes.pdfIn PDF document text
    • http://mogoxopedutisaw.iblogger.org/bartaman_newspaper_today.pdfIn PDF document text
    • http://dress-russia.ru/benefits_of_chanting_vishnu_sahasranamam_in_tamil1hmuj.pdfIn PDF document text
    • http://katermore.ru/how_to_repair_a_remote_control_helicopter9nidt.pdfIn PDF document text
    • http://vutajazelige.medianewsonline.com/anatomie_occulte_de_l_homme.pdfIn PDF document text
    • http://kuboduzuke.mypressonline.com/xuvipovifajezetapeg.pdfIn PDF document text
    • http://adv-workshop.site/furefari5xtdd.pdfIn PDF document text
    • http://tricitysikhs.com/cuantos_son_5_inches_en_centimetrospgzuk.pdfIn PDF document text
    • https://gejodawutu.weebly.com/uploads/1/3/1/1/131164152/6233f0fba36.pdfIn PDF document text
    • https://vubisurajoguv.weebly.com/uploads/1/3/4/2/134265568/0a30492498b8dc7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nilubipaviwi.rf.gd/financial_accounting_sap.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/present_perfect_and_past_simple_exercises_doc.pdfIn PDF document text
    • http://pabadebaluke.rf.gd/gunnison_river_flow_report.pdfIn PDF document text
    • http://muvekalufisu.atwebpages.com/rival_electric_food_slicer_model_1030v_4.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/fedex_drop_off_grand_junction.pdfIn PDF document text
    • http://pitaken.onlinewebshop.net/asthma_bts_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/free_html5_templates_for_blogs.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_off0000e2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 5668 bytes
SHA-256: 224e9bb488e501e8b6e8e109bdf70b3524902d3949805f323c1474250a2a513e
font_01_sfnt_off0000f5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5ED 10392 bytes
SHA-256: 84502eb0c8fc82240fbef567ec10738a71678e3182e837441cfe09ff04c26963