Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7f01785a883a44…

MALICIOUS

PDF

78.9 KB Created: 2021-06-07 10:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 704a3fcc957e2ffe48e241aac7ebae47 SHA-1: 33c078a72f14c57a4620f5b0a5820e9fd12436ca SHA-256: ef7f01785a883a443ef91c8da646effcf6d05c096c57f18da6bb6fd2cc93e643
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://chcial.ru/pbw?utm_term=palabras+de+condolencias+para+una+amiga+que+fallecio PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494883/normal_60310a98dd138.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456135/normal_60515de32463a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501037/normal_60306325b92c3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d84261cf-c027-451b-b28c-834af3987f24/xikozil.pdfIn PDF document text
    • http://tewabavuxate.pbworks.com/w/file/fetch/144781125/lufipepepasavifagijunexo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2583acec-8e42-4a40-8aa6-c03ee08cdb81/potajaximi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/178af5f3-0cc6-4b76-aa8e-81249fdf6d40/dosanafujakarakoxo.pdfIn PDF document text
    • http://fixulirulafa.pbworks.com/f/fundamentals_of_anatomy_and_physiology_10th_edition_for_rent.pdfIn PDF document text
    • http://zuwofig.pbworks.com/w/file/fetch/144536850/alight_motion_mod_apk_3.6.1_happymod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d58f91f-d8c8-4ae4-beca-965e389f7b98/10000_reasons_chords_capo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daa7fa06-2164-4a42-8bbf-e87f11d0c03c/sifajetuloge.pdfIn PDF document text
    • http://xetibubib.pbworks.com/w/file/fetch/144580227/how_do_i_hide_and_unhide_apps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e37f8c0-9e58-420d-ae42-bcd5e0d560b1/76975526056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/319353aa-286c-4e12-b876-fa1b5323a9ca/wumoxeti.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/f/mongodb_university_m001_final_exam_answers.pdfIn PDF document text
    • http://bojirakaj.pbworks.com/f/1176114755.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cdb6cf7-24dc-481b-ba7e-18f44a161282/comandos_para_configurar_un_switch_cisco_2960.pdfIn PDF document text
    • http://xetuduju.pbworks.com/w/file/fetch/144668922/opera_browser_latest_version_for_pc_offline_installer.pdfIn PDF document text
    • http://xizegopago.pbworks.com/w/file/fetch/144602382/kubesisigepojokomizax.pdfIn PDF document text
    • http://murenet.pbworks.com/w/file/fetch/144745554/tazopexutibopa.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_off0000f054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF054 5744 bytes
SHA-256: 8add5b8812e43ca3fa2c181eb31f44bc3b6969e706f060cc724451c174edf4cb
font_01_sfnt_off000103b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B2 12652 bytes
SHA-256: f6ae45672b8c72bb97ce88d4a906f0d4ef53ab967cba95eb0e65339c0a42ba78

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