Malicious PDF — malware analysis report

Static analysis result for SHA-256 4340f22cd47d3432…

MALICIOUS

PDF

89.6 KB Created: 2021-03-20 11:35:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5d61955c92a1ce5098f08cc4088a4c87 SHA-1: 86e0465347e0cb57d3a78a1cef8c4e47634f0e39 SHA-256: 4340f22cd47d3432a8f5417808f7712cf3b73583f3efca10181e509d70c57acd
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 0.9996

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://ponafet.ru/123?utm_term=little+oxford+thesaurus+pdf PDF link annotation
    • http://evromotors.net/essential_calculus_early_transcendentals_solutionsogk3h.pdfIn PDF document text
    • http://silver35.ru/somewhere_over_the_rainbow_acordes_guitarra_capov9jjv.pdfIn PDF document text
    • http://tugrull.com/hero4_silver_vs_blackiwj5z.pdfIn PDF document text
    • http://vurejowug.mypressonline.com/excel_vba_find_last_row_in_selected_range.pdfIn PDF document text
    • http://pogibofabut.getenjoyment.net/13404140312.pdfIn PDF document text
    • http://depotupunejiwo.iblogger.org/56491444777.pdfIn PDF document text
    • http://goxadonivibifiw.22web.org/rikekiwirunarazekebi.pdfIn PDF document text
    • http://nuraramibifowom.22web.org/adsorption_isotherms.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_eb499882ad8f48faa53290827ac74578.pdf?index=trueIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_f2bca80fb30447eb904a0bbee469a64c.pdf?index=trueIn PDF document text
    • http://setekavapitefe.rf.gd/liebherr_concrete_batching_plant.pdfIn PDF document text
    • http://wuwedutukuw.epizy.com/78365150266.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/discrete_time_signal_processing_solution_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/renuzefalolovewigilodomen.pdfIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_b116aa62d79144e3867ac70ab7dc1096.pdf?index=trueIn PDF document text
    • http://mafilijesov.epizy.com/beautiful_things_chords_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/50821626538.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B0 13268 bytes
SHA-256: 2752993a775614d221a661c058dad987b47b14656ed8364272baa1779dd85c49
font_01_sfnt_off00010b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B81 5136 bytes
SHA-256: a92340579ad346103cd192d84e2679af9dd1eacf62046950612a1b03b648c89c
font_02_sfnt_off00011cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFE 11324 bytes
SHA-256: d97b1e64095e4ff50c3ed1b1b8e80f78f2223a24f57808f8bd44dc36e80092d3
font_03_sfnt_off000143cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143CC 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8

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