Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da9847b1e4f9a24…

MALICIOUS

PDF

78.4 KB Created: 2021-06-01 10:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3a1a116f0a54f08fb1c813103ec7289e SHA-1: 57cb6436326cdf2b580d6ee98f367609ff0e9158 SHA-256: 1da9847b1e4f9a24a334dd32787658c42888ec7b2b57fac130206d995fe03761
126 Risk Score

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 0.9996

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://laborke.ru/pbw?utm_term=printable+the+love+dare+list+1-40+pdf PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4383689/normal_60b1c79bee2f5.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4449771/normal_60b4f12cdddb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469375/normal_6025c4b4db032.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476593/normal_603168ca0f9cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469119/normal_60480c72c854c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405652/normal_600705f8cecd8.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
    • http://wuxikadafi.pbworks.com/f/33619255508.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/iso_14001_internal_audit_checklist_xls.pdfIn PDF document text
    • http://botinuba.pbworks.com/f/25788680574.pdfIn PDF document text
    • http://muxopal.pbworks.com/w/file/fetch/144440454/innovation_and_entrepreneurship_exam_questions.pdfIn PDF document text
    • http://ridelox.pbworks.com/f/57805029575.pdfIn PDF document text
    • http://bekivuxuga.pbworks.com/f/linagolejebogofilotam.pdfIn PDF document text
    • http://tebejeloxid.pbworks.com/f/weber_cutting_machine.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/f/zibupogozubokex.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/w/file/fetch/144426855/gta_san_andreas_cleo_mod_apk_v2.00.pdfIn PDF document text
    • http://fubajulak.pbworks.com/f/sabodipibapesoxekofirevuv.pdfIn PDF document text
    • http://dipoziw.pbworks.com/f/yeni_balayanlar_iin_kolay_karakalem_almalar.pdfIn PDF document text
    • http://zikupuzajix.pbworks.com/w/file/fetch/144450006/minecraft_download_unblocked_1.5_2_google_drive.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/25858250845.pdfIn PDF document text
    • http://banusiv.pbworks.com/w/file/fetch/144446319/myles_munroe_books_kingdom.pdfIn PDF document text
    • http://natizasex.pbworks.com/w/file/fetch/144411591/active_and_passive_voice_worksheets_for_class_6_cbse_with_answers.pdfIn PDF document text
    • http://siruzosu.pbworks.com/f/app_hider_for_android_without_root.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_off0000e4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 5432 bytes
SHA-256: 9d9ed7701da1e49f72dda9da562c698c3abb2e9dc184aaa47e4712ccfd6d96cf
font_01_sfnt_off0000f759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF759 11536 bytes
SHA-256: 8825081e78c75ecde11556a10d0847fdf46708a5fd6a164f6b67d29666f1bdd9
font_02_sfnt_off00011de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE9 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2