Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea8af0ea5fc9a74e…

MALICIOUS

PDF

77.2 KB Created: 2021-01-19 22:12:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5c1bc0f43f6e97fbd84d460e5c95e44e SHA-1: b217c348feb23369825b38af428b8ccc910b3f5c SHA-256: ea8af0ea5fc9a74ec3676cb0a30e40cd92a15f4449bb59758ba19a1dee06d4cb
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. The document body, though garbled, contains text related to 'free tiktok followers' and 'no survey', reinforcing the phishing lure.

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://baarspo.ru/123?utm_term=how+to+get+free+tiktok+followers+no+survey PDF link annotation
    • http://xokubenafap.66ghz.com/obhajoba_bakalsk_prce.pdfIn PDF document text
    • https://site-1179780.mozfiles.com/files/1179780/milestones_chart_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481406/normal_5ff405f4186ef.pdfIn PDF document text
    • https://site-1186310.mozfiles.com/files/1186310/best_online_brain_games_for_seniors.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_5f89ed270a5c9.pdfIn PDF document text
    • https://cdn.sqhk.co/sejixikerut/jhgdhhL/equalizer_2_soundtrack_end_credits.pdfIn PDF document text
    • https://cdn.sqhk.co/munoforifuso/Nibhgyp/pazixodo.pdfIn PDF document text
    • http://logunej.iblogger.org/acrobat_reader_alternative_android.pdfIn PDF document text
    • https://cdn.sqhk.co/wavefekus/gigBgg1/nogewalakovikofen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zarazemudaseri.epizy.com/63154116014.pdfIn PDF document text
    • http://zilomit.epizy.com/57323846929.pdfIn PDF document text
    • http://nerepigov.rf.gd/agendas_2019_gratis_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/nudafi.pdfIn PDF document text
    • http://pususarejopo.epizy.com/organic_compounds_chart_worksheet.pdfIn PDF document text
    • http://fonunegemo.epizy.com/tawogilananob.pdfIn PDF document text
    • http://mafofeguf.epizy.com/padepit.pdfIn PDF document text
    • http://zatafefot.rf.gd/computer_video_recorder_software_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE54 5168 bytes
SHA-256: 3ff9fe04f894a04e44e18b2b0d5f17d2a1fda23ac5184436a110a923418657a1
font_01_sfnt_off0000f027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF027 5004 bytes
SHA-256: f248e9860c9ad118bf67a0ede364a6b7a4e3ee454878dcf7d93105396db2accd
font_02_sfnt_off00010165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10165 11272 bytes
SHA-256: ef3ac9fec8c82fb8c72f1810acae555cf8e62b21bca305c07155b61581c28a18

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