Malicious PDF — malware analysis report

Static analysis result for SHA-256 394d4581e8cb3b88…

MALICIOUS

PDF

89.8 KB Created: 2021-02-22 19:46:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 79ccc57e3a54e5c3bb18ef477b617082 SHA-1: a902f33a85c42f3da32c19206ef1bdb459da59e5 SHA-256: 394d4581e8cb3b88601b96c32fc1882e3bebfd7730a970b7adc1c5e9d5692970
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 hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though partially corrupted, indicates a lure related to a book summary, which is a common tactic for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=resumen+del+reino+de+este+mundo+por+cap%25C3%25ADtulos PDF link annotation
    • https://cdn.sqhk.co/tatakakuwito/gg1hbgj/fill_gradient_color_photoshop.pdfIn PDF document text
    • https://cdn.sqhk.co/josurowelimu/iahajaE/cara_cheat_farmville_2_country_escape_android.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/jicmX32/tesuvatozovodawu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375353/normal_5fd0a6b6c04b4.pdfIn PDF document text
    • https://cdn.sqhk.co/wajuletixex/gmgdAjh/professional_photography_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/javukapegami/iijjSCs/pentimento_art_painting.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495055/normal_601ef0e0108ce.pdfIn PDF document text
    • http://dunetetemob.22web.org/estudios_biblicos_para_predicar.pdfIn PDF document text
    • http://dutebolidetol.iblogger.org/song_betrayed_lil_xan.pdfIn PDF document text
    • http://rirarojafetojep.iblogger.org/87544823853.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390641/normal_602e722fa87b5.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/resixexi/bavofekugefex.pdfIn PDF document text
    • http://tiliken.rf.gd/bebas_neue_pro_regular.pdfIn PDF document text
    • http://golemibafub.epizy.com/lokabudevuk.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/espresso_android_interview_questions.pdfIn PDF document text
    • http://koriguno.rf.gd/47323222563.pdfIn PDF document text
    • http://novosumagib.epizy.com/sbi_anywhere_apk_5._3._16.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/speed_distance_time_graph_worksheet.pdfIn PDF document text
    • http://zaxutakizet.epizy.com/63750006667.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_off00012271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12271 5280 bytes
SHA-256: 4ddb3d35fda5755eb155afe6c8d45dfd37d671e3910a63989063d8c1fdbd67f2
font_01_sfnt_off00013451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13451 10744 bytes
SHA-256: 02a4fd8358ff6652375f11ec977062e444bbf8a82ce87c1c38b2ab9603d5500f

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