Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e079098416b70e5…

MALICIOUS

PDF

178.9 KB Created: 2021-04-03 14:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4b1ff36a223759aabb44707e2f3fd14f SHA-1: 40a76aadd39449bb248cb7911abaa060251d532d SHA-256: 8e079098416b70e581f05fea7eea1fd05c380d9b4697dbea819b2cb1266b5044
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains keywords related to downloading a 'solution manual', indicating a lure to entice users to click on the malicious links.

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://baarspo.ru/strik?utm_term=classical+mechanics+goldstein+solution+manual+download+pdf PDF link annotation
    • http://gepokupaburorew.mywebcommunity.org/92356437871.pdfIn PDF document text
    • http://vafakewa.iblogger.org/american_dj_mini_dekker_manual.pdfIn PDF document text
    • http://bifitiguz.iblogger.org/maine_pyar_kiya_movie_mp4.pdfIn PDF document text
    • https://kejedavozeve.weebly.com/uploads/1/3/1/4/131483662/163685.pdfIn PDF document text
    • https://mikedexe.weebly.com/uploads/1/3/1/4/131452733/libezopajesikap-fagopiwuboxo-kezovobejelem.pdfIn PDF document text
    • http://libizusuro.iblogger.org/lifurufazumunesu.pdfIn PDF document text
    • http://siwupojotuj.getenjoyment.net/organelas_celulares_e_suas_funes_resumo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/438a5a66-f0fb-4302-96b4-463d2ddb4705/epson_surecolor_p800_inkjet_printer_uk.pdfIn PDF document text
    • http://wemikovovafebo.epizy.com/5th_grade_math_multiple_choice_questions.pdfIn PDF document text
    • http://vuzudaru.epizy.com/wamarotabapomov.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/garfield_2004_full_movie_in_tamil.pdfIn PDF document text
    • http://waxeduvipi.epizy.com/los_nombres_de_dios_en_el_antiguo_testamento_y_su_significado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff940b9b-d4fe-4650-be4b-d1ffb1648093/thomas_calculus_13th_edition_solution_manual_free.pdfIn PDF document text
    • http://dixasimoxipux.rf.gd/lefizafojot.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/quantitative_versus_qualitative_research_in_nursing.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/tv_samsung_4k_50_nu7100_tem_bluetooth.pdfIn PDF document text
    • http://pevutedijubixit.epizy.com/athabasca_rcmp_report.pdfIn PDF document text
    • http://tolelagegovoz.epizy.com/capsule_full_chapter.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000260f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x260F8 5472 bytes
SHA-256: e8f2facc75cbaf981738bde37b9022065344d5db333f005c1f520245bd27401a
font_01_sfnt_off0002737f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2737F 15556 bytes
SHA-256: 5d8916ec765f6bd5fc0479a2bc727f4012227ac461bfe673b4e98aaaab9aa4c4
font_02_sfnt_off0002a745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A745 16296 bytes
SHA-256: f142735880ee39e6cc14ffd1e8211f56d6c2db536caa937876e71252a0c08df0

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