Malicious PDF — malware analysis report

Static analysis result for SHA-256 27258d1f3100115e…

MALICIOUS

PDF

81.4 KB Created: 2021-03-19 10:22:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5de2435049949a0e3674d79ca1767ed5 SHA-1: 5e51a16b66e368fe12eae2044696f390edc31dcc SHA-256: 27258d1f3100115e00fdfb8a8046cddd3afe61f5439fe600aa307730330719db
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 0.9998

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://seumenha.ru/strik?utm_term=what+is+the+meaning+of+a+rabbit+hole PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485163/normal_6024a748481c7.pdfIn PDF document text
    • http://votixibutiro.medianewsonline.com/veredogo.pdfIn PDF document text
    • http://tulumiv.medianewsonline.com/bitumen_test_is_code.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403673/normal_6014465ddd426.pdfIn PDF document text
    • http://zonokiwuwagupu.getenjoyment.net/adding_integers_number_line_worksheet.pdfIn PDF document text
    • https://kavosimodo.weebly.com/uploads/1/3/4/9/134901779/0faabc8732808.pdfIn PDF document text
    • http://xivekoto.medianewsonline.com/all_network_ussd_codes.pdfIn PDF document text
    • https://wafulezejo.weebly.com/uploads/1/3/4/7/134748518/76f4fff6.pdfIn PDF document text
    • http://mejumeroxara.mywebcommunity.org/19652550933.pdfIn PDF document text
    • http://kovativegapok.getenjoyment.net/zetetic_astronomy_parallax.pdfIn PDF document text
    • http://najelipopusivut.getenjoyment.net/what_movie_did_vision_turn_human.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bokelur/55567672050.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/691ce2ef-8ba1-41ac-a575-6bf7c31a4357/fisher_mama_bear_wood_stove_baffle.pdfIn PDF document text
    • http://pezamax.myartsonline.com/what_is_the_habitat_of_a_spider.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/22679046974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cb013ac-e3e8-4484-afeb-c18b510a7703/jagupeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f44196b-5286-443a-b1e8-5f64f1816cdb/35232628410.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/ireland_company_registration_number_format.pdfIn PDF document text
    • http://zogadawedalifap.onlinewebshop.net/bahaya_rokok_bagi_perokok_pasif.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_off0000ef62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 5120 bytes
SHA-256: d4234a2fee086cf25c6efd1a465ae8cde953bfe1423eca8e0c85cfb97bdcd68a
font_01_sfnt_off000100ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AB 11640 bytes
SHA-256: e335b93c29e7be78f32e839cf8244df36a5f72de5f6356dffca8d8431b9dd3fc
font_02_sfnt_off00012879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12879 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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