Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9ce7239829e6d9…

MALICIOUS

PDF

73.5 KB Created: 2021-03-22 03:27:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6f386146134ffead6f2eb1ebcc499037 SHA-1: 7d12d2a54f1d83a490209823b77059b9eb7ee82a SHA-256: bf9ce7239829e6d98fec0d789647b984bb00ad28937116eb9476526c980968e4
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs that redirect to various disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to outboard motor fuel mix, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=what+fuel+mix+for+a+outboard+motor PDF link annotation
    • https://cdn.sqhk.co/vudupapuj/5jhadV1/ryan_toysreview_jurassic_world.pdfIn PDF document text
    • http://puwexakibo.iblogger.org/duvumoxopipo.pdfIn PDF document text
    • http://gawudubigojan.getenjoyment.net/athanasius_of_alexandria_books.pdfIn PDF document text
    • https://cdn.sqhk.co/ferorigife/cjhgfhe/nascar_speedpark_smoky_mountains_prices.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/mhhicSW/lowes_swing_sets_installed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375907/normal_602e42c228936.pdfIn PDF document text
    • https://cdn.sqhk.co/desiruzag/3Vie0gg/kugafolipijipadux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420250/normal_604d043dc753b.pdfIn PDF document text
    • https://cdn.sqhk.co/nifijagik/idjcdBJ/kawopetamawinuxajaviwe.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/gedexim/social_psychology_is_the_scientific_study_of_how_a_persons.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/assault_android_cactus_boss_guide.pdfIn PDF document text
    • http://xigavuda.rf.gd/pofuxulijijizudodixa.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/can_you_keep_a_secret_movie_2019_where_to_watch.pdfIn PDF document text
    • http://rujidafedisezu.atwebpages.com/46034252025.pdfIn PDF document text
    • http://wofiriperajune.epizy.com/allan_quatermain_libro.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/18876594364.pdfIn PDF document text
    • http://voxinuxo.epizy.com/buganifokuwizavojowuro.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/gatesiga.pdfIn PDF document text
    • http://rawuvotatu.rf.gd/99860574733.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_off0000e517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE517 5188 bytes
SHA-256: e8f3c15d5cbcd6dedad6a606a6a209c70f73adc1521fd10d887c86ee19c97cf9
font_01_sfnt_off0000f6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A3 9904 bytes
SHA-256: e32464ed48eecdea5fc8cd84f84eaf14ad37072a18443c0c24ce7e016d85896e

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