Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ac8fbbcc08d84d…

MALICIOUS

PDF

74.8 KB Created: 2021-03-14 18:23:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 88cda6ab10eebad2c132430f1a1a404b SHA-1: 9fa6ae347738e2b6e854860708916cd2d93379f5 SHA-256: 97ac8fbbcc08d84daf3369b178dae71dc811a8a2ef38b1717da6f9c6630c0abb
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://kuzutuzo.ru/award?keyword=cryptocurrency+mining+for+dummies+pdf PDF link annotation
    • https://cdn.sqhk.co/rinugezig/UQOjbXn/sobuzekal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493920/normal_5fcecdddc1991.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/ghaifRb/security_camera_mod_for_minecraft_pe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476768/normal_603e52a56b660.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413126/normal_5fd78d0570169.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/83372543843.pdfIn PDF document text
    • https://cdn.sqhk.co/ligumorik/gjjghje/dusof.pdfIn PDF document text
    • http://fuwijumazawad.mywebcommunity.org/how_to_operate_black_diamond_storm_headlamp.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/ejdDhc3/81788735159.pdfIn PDF document text
    • https://cdn.sqhk.co/kesavaki/uHWgeij/sokisiguluzufu.pdfIn PDF document text
    • https://cdn.sqhk.co/rowazazapa/DXkgcib/need_for_speed_most_wanted_soundtrack_cd.pdfIn PDF document text
    • http://suvekitubexeso.getenjoyment.net/pdf_file_reader_free_download_for_android_mobile.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/gavexilatuvitaz/id_card_making_software_full_cracked.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/budget_excel_template_personal_finance.pdfIn PDF document text
    • http://pegewolonu.rf.gd/54251717375.pdfIn PDF document text
    • http://josekopiguvalup.epizy.com/bhagavad_gita_word_to_word_translation_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/antithrombin_deficiency_guidelines.pdfIn PDF document text
    • http://suxudogakol.myartsonline.com/honeywell_bms_system.pdfIn PDF document text
    • http://mekigutesazi.epizy.com/pavokepotewijenopifamup.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_off0000e636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE636 5240 bytes
SHA-256: 86cb822095d623a4aaff6e61681d6e5dddac3bf818c1c2894eb721bc98abe331
font_01_sfnt_off0000f805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 10696 bytes
SHA-256: c3d6e6e0f287dde46dc79fe8a5484172c65847f1651d62de4ffddf19d53ced76

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