Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca396de5fceea3ca…

MALICIOUS

PDF

75.5 KB Created: 2021-06-12 04:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c13f3923ae8dd126f22daeda729ccdb4 SHA-1: 9ca42933af7cecad087c743938682fe92df68104 SHA-256: ca396de5fceea3ca7eff33d698df2627547bc6254181dff12c6f0b759a8602a4
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 0.9960

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://smidgel.ru/pbw?utm_term=ssat+middle+level+practice+test+pdf+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465010/normal_605af3b285a00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371240/normal_602c21f3ea521.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481994/normal_6063f3178bb57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373986/normal_604d82bb8503f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373004/normal_5ff26211c78e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401982/normal_60b86e4d0c2a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387218/normal_601dcf40ac027.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365536/normal_600514700f679.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424982/normal_605aeb1b0ef4a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kiletejude.pbworks.com/w/file/fetch/144412560/54547765168.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/patch_adams_full_movie_online_free_123movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fde9010-cc10-4e50-a85d-392e1cd6024a/how_to_setup_amazon_echo_dot_in_hindi.pdfIn PDF document text
    • http://lifevuve.pbworks.com/f/30477856882.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86d89db9-9e97-400f-a7f9-88641f05451a/nobedukibenilobudutiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21270caf-e351-49a9-88c4-6c5a6430c3c7/what_is_a_psychological_assessment.pdfIn PDF document text
    • http://murenet.pbworks.com/f/neonatal_growth_chart.pdfIn PDF document text
    • http://josinibugaju.pbworks.com/w/file/fetch/145134261/total_english_elementary_students_book_free_download.pdfIn PDF document text
    • http://pewudomame.pbworks.com/f/shane_mcmahon_ringtone_download_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28d63e0d-6f98-46d2-824b-947b9c9603c5/polk_audio_3000_subwoofer_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/820d4b45-06a8-4ba3-b4d6-29c22b6dc1fc/73620111140.pdfIn PDF document text
    • http://kibumezi.pbworks.com/w/file/fetch/144711285/zilupazolorepujerilom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/038b3c1d-cbba-4096-a830-8ddb149fdf83/81329300899.pdfIn PDF document text
    • http://jubujefaj.pbworks.com/w/file/fetch/145088559/dj_vyrusky_ft_shatta_wale_baby.pdfIn PDF document text
    • http://lakiluxodev.pbworks.com/f/exercices_corrigs_sur_le_thorme_du_moment_cintique.pdfIn PDF document text
    • http://supatibu.pbworks.com/w/file/fetch/144909909/image_to_converter_apk_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15c6d1f8-11ee-413d-bbea-06b21882e5ef/suzojuf.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_off0000e5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BF 5948 bytes
SHA-256: a2c7d29798474987496cd7ef2d97d166eae054b55f28d946e26eee08f20cb811
font_01_sfnt_off0000f9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EF 12052 bytes
SHA-256: 6c4735eb6db3adacd9fb480b028e641049d45dff10c3289357754512aef07c45