Malicious PDF — malware analysis report

Static analysis result for SHA-256 da637b9e25d1439b…

MALICIOUS

PDF

72.1 KB Created: 2021-02-12 03:41:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 16d67ce41ceebdea4a7af6448f4c35b5 SHA-1: 51171f884ddc5a54a01f8079bd4c11ed443b4321 SHA-256: da637b9e25d1439b9c58e8435b9997846620f186c28e810ac031b0672dd26f9f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it uses a browser extension installation lure to trick users into executing malicious content. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://baarspo.ru/wb?keyword=block%20ads%20google%20chrome%20android PDF link annotation
    • https://cdn.sqhk.co/ritasuxa/getpVTk/xofumoxidaratosi.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/geOKRS9/vugalodew.pdfIn PDF document text
    • https://cdn.sqhk.co/fovipobex/4jfxKWW/tubagiritojewe.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/jggeqif/hyper_rare_pokemon_cards_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/novupezezis/h7kMzig/99690902890.pdfIn PDF document text
    • https://cdn.sqhk.co/dawafawux/dHhbima/dog_fighting_games_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/pogezasamu/1jgjgcg/marxist_leninist_party_usa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385634/normal_5fc97a267878d.pdfIn PDF document text
    • http://kanobukomovis.iblogger.org/tirupu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421783/normal_5feaf2fb1f1d8.pdfIn PDF document text
    • https://cdn.sqhk.co/konarolikomu/igtzOhe/luxury_real_estate_paradise_island_bahamas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464327/normal_5ff9ad3e87cac.pdfIn PDF document text
    • https://cdn.sqhk.co/muwazubivotu/hjhuBhg/totabalekenipow.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/bawalidamovidud/bigeninujusuwukubawakigu.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/26662913606.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/bunty_aur_babli_film_video.pdfIn PDF document text
    • http://xeganidirosup.rf.gd/40211569936.pdfIn PDF document text
    • http://wunilos.epizy.com/ice_sheets_melting_effects.pdfIn PDF document text
    • http://mepusafufeja.rf.gd/mivilitewapumuki.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/unit_conversions_worksheet.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_off0000dd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1F 5468 bytes
SHA-256: 29d74f849d8e0a271bf2a319129c564a8f558e5fae221b0aa6b4519c98f83334
font_01_sfnt_off0000ef8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8C 10524 bytes
SHA-256: 23ae491015a5bd5eeceb9d7cde8a7429d6fe1049e39a940115d40e9ae97cee47

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