Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbafff30e6ecbe4a…

MALICIOUS

PDF

83.8 KB Created: 2021-04-06 06:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4b57ad833819f7332361ab91d58089fe SHA-1: 317da7c34ef3608a31f8bf0327f398328c4a8a56 SHA-256: bbafff30e6ecbe4a2a23e55e9eeff63b8d34850820025bb2505265b47db13c2f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9995

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://dugedepap.ru/award?keyword=ilmu+retorika+pdf PDF link annotation
    • http://vosalax.22web.org/guided_reading_lesson_plans_for_first_grade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468820/normal_6027d186b136f.pdfIn PDF document text
    • http://beguwidip.scienceontheweb.net/91378689113.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/flubber_movie_questions_and_answers.pdfIn PDF document text
    • http://fefixuj.iblogger.org/how_to_get_better_at_life_drawing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484359/normal_60614f7f7c923.pdfIn PDF document text
    • http://pekefosijemibi.sportsontheweb.net/zukes.pdfIn PDF document text
    • http://zuvalasit.mypressonline.com/46137125948.pdfIn PDF document text
    • http://doxalasi.mywebcommunity.org/31488915408.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371247/normal_602a1d9845eb0.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/canada_visa_form_5257.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://miloxirabufa.epizy.com/dead_space_apk_free.pdfIn PDF document text
    • http://siletafelit.epizy.com/tapaxobamedusos.pdfIn PDF document text
    • http://kageditivumimor.onlinewebshop.net/tuvuzopoveritutijalej.pdfIn PDF document text
    • http://dokaginiw.epizy.com/what_are_the_rules_of_differentiation_in_calculus.pdfIn PDF document text
    • http://janalusexisowa.epizy.com/adiabatic_saturation_temperature.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/sherlock_holmes_book_series.pdfIn PDF document text
    • http://nabenejajoko.myartsonline.com/28770349324.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/madhavaram_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/aircraft_maintenance_engineer_jobs_abroad.pdfIn PDF document text
    • http://sesatikozuv.epizy.com/alfred_marshall_principios_de_economia.pdfIn PDF document text
    • http://vumavezes.epizy.com/organizational_structure_of_advertising_agency.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_off00010ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC1 5012 bytes
SHA-256: 25c95356f4bf494e1ec8ea10a26576f016efb6ac7cb6f58e48646bb04b172ee8
font_01_sfnt_off00011bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB6 11208 bytes
SHA-256: 4c9d3ce7ac5f5c5d5f55c4faafedc18d4295efe52782f3059cf0a9bdb37fbf7b

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