Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cbbe1ab88b61f4b…

MALICIOUS

PDF

77.3 KB Created: 2021-03-30 01:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5afad1ddd257e7a4c5102529a9bc49fb SHA-1: 5783a707d195371df7a41dab4c89dd4e5ff886f9 SHA-256: 5cbbe1ab88b61f4b7b8d1b72fa275ba6bd5c838c09d1726ba3be478d32ef63a2
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 0.9997

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://xajibur.ru/strik?utm_term=briggs+and+stratton+550ex+oil+plug PDF link annotation
    • http://telemprom.xyz/quality_control_technician_interview_questions_and_answers1tdys.pdfIn PDF document text
    • http://gobigs.space/39895653830q7hje.pdfIn PDF document text
    • http://musc-media.xyz/casio_wave_ceptor_manual_335319h82.pdfIn PDF document text
    • https://cdn.sqhk.co/wojipezusax/igUlhcH/85787204026.pdfIn PDF document text
    • http://habercigo.com/3d_neon_race_2_unblocked6wxj6.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/dx0idgh/asteroid_definition_in_simple_language.pdfIn PDF document text
    • https://cdn.sqhk.co/jerowerar/cspvibY/gaxekovulodulezidedo.pdfIn PDF document text
    • http://narosisebono.22web.org/cinetica_de_crecimiento_bacteriano.pdfIn PDF document text
    • https://cdn.sqhk.co/rowagana/d6PjdOi/associational_form_works_most_like_quizlet.pdfIn PDF document text
    • http://choosemadam.site/70288162249g9n59.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/rijaliwiguvex/puzokubuvutanafelom.pdfIn PDF document text
    • http://zabuzuko.epizy.com/14280264722.pdfIn PDF document text
    • http://tesuzegijibonu.epizy.com/minetta_tavern_michelin_guide.pdfIn PDF document text
    • http://segefebeb.epizy.com/life_application_study_bible_nkjv.pdfIn PDF document text
    • http://wupubobetob.epizy.com/2291651000.pdfIn PDF document text
    • http://texatopewewew.epizy.com/unique_powerpoint_presentation_templates_free.pdfIn PDF document text
    • http://dagimasara.epizy.com/simile_and_metaphor_lesson_plan.pdfIn PDF document text
    • http://runapapaxezupow.rf.gd/how_do_i_write_a_case_study_in_apa_format.pdfIn PDF document text
    • http://zufomukibataj.rf.gd/47734041665.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/sheet_pan_roasted_broccoli_pasta.pdfIn PDF document text
    • http://xafonabikox.rf.gd/lab_report_10_integumentary_system.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_off0000eeca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECA 5512 bytes
SHA-256: 09ba827836d84063116132f2347672b0998f5726966830cdcf8cd98bbca59b48
font_01_sfnt_off0001019a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019A 11220 bytes
SHA-256: 1de43b4f71ab2fe5f78ca5f0ce1d3a67f2940c7e515f18bfd23a0da24fcd1f7e

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