Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca665ed99cd3d943…

MALICIOUS

PDF

85.2 KB Created: 2021-06-14 06:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 87001420191f95f16588fb53c482b1b7 SHA-1: ae3455424ceeefe34716e3a0bf06b8bbbd14ac53 SHA-256: ca665ed99cd3d943cb896ca70782f5b01e8fef937b8c38460b4bb66db19ae821
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with the primary one being `https://pixomot.ru/pbw?utm_term=sat+2019+math+questions`. Heuristics indicate this PDF is a link farm on disposable hosting, and ClamAV detected it as `Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0`. The ML classifier also flagged it with high confidence. The document body, though heavily corrupted, suggests a lure related to 'Sat 2019 math questions'.

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://pixomot.ru/pbw?utm_term=sat+2019+math+questions PDF link annotation
    • https://wupovejiti.weebly.com/uploads/1/3/2/8/132814541/cec32f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446398/normal_60b93692283e7.pdfIn PDF document text
    • https://xenolato.weebly.com/uploads/1/3/4/8/134868471/lifitoratilog-fotoli-sekifajamoj-sipepewedemiv.pdfIn PDF document text
    • https://bevokelas.weebly.com/uploads/1/3/4/3/134310014/fewedur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385028/normal_6065ac6895f12.pdfIn PDF document text
    • https://vazoxavaver.weebly.com/uploads/1/3/4/8/134863882/3009ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496165/normal_60351e199580a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497638/normal_601fefaa9e28a.pdfIn PDF document text
    • https://xogosikeduvad.weebly.com/uploads/1/3/4/6/134669078/3206050.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wasuzuk.pbworks.com/f/redakudub.pdfIn PDF document text
    • http://gemometis.pbworks.com/f/dil_diyan_gallan_full_movie_punjabi_2019.pdfIn PDF document text
    • http://nowefuro.pbworks.com/f/lonely_planet_turkey_download.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/f/how_do_you_know_if_a_liquid_is_polar_or_nonpolar.pdfIn PDF document text
    • http://jazufawaroj.pbworks.com/f/critical_role_player_sheets.pdfIn PDF document text
    • http://zepadatoju.pbworks.com/w/file/fetch/144640146/83598200107.pdfIn PDF document text
    • http://pugaxigodaka.pbworks.com/w/file/fetch/145085292/reading_exercises_for_intermediate_students.pdfIn PDF document text
    • http://tugewuvog.pbworks.com/w/file/fetch/144715860/77316122151.pdfIn PDF document text
    • http://kedajawi.pbworks.com/f/houghton_mifflin_algebra_2_practice_workbook_answer_key.pdfIn PDF document text
    • http://morabef.pbworks.com/w/file/fetch/144628014/returning_to_work_after_maternity_leave_letter_template_teacher.pdfIn PDF document text
    • http://kakewizajupe.pbworks.com/w/file/fetch/144769698/rangers_apprentice_books_in_order.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_off00010c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C15 5508 bytes
SHA-256: 5a715d68e371b7c13af42947c76a13a095090aa0ca45eca4588157fe2c8b7b61
font_01_sfnt_off00011eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAF 11708 bytes
SHA-256: 8e0c713d4b3b3a1a234fa426c6bfe9aa4bc31d8646dcfdf3adcf4ac8c8775610

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