Malicious PDF — malware analysis report

Static analysis result for SHA-256 3877234c6284affb…

MALICIOUS

PDF

87.4 KB Created: 2021-06-11 22:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c5b2767e0796429d19f290d6e9dd0add SHA-1: c739c8d81d8d5a4cc10f7f07b9ddd12fce15febf SHA-256: 3877234c6284affb4534a35ac5e1ee20eecc67173d8721161368722f7870c8c2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is a strong indicator of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests the document's purpose is to host a collection of links, likely for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://krisoc.ru/pbw?utm_term=okana+abto+murli+ringtone PDF link annotation
    • 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://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b9ffc92-8f32-485f-87bc-56bae5e05805/24086147033.pdfIn PDF document text
    • http://zegugas.pbworks.com/f/sheikh_ahmed_deedat_books.pdfIn PDF document text
    • http://vimiluze.pbworks.com/w/file/fetch/145124856/venuseb.pdfIn PDF document text
    • http://dawijunegolo.pbworks.com/w/file/fetch/144422619/reset_ink_level_epson_l110_software.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/w/file/fetch/144483342/dalofogolufefe.pdfIn PDF document text
    • http://xixokuzujoz.pbworks.com/w/file/fetch/144568797/how_do_you_reset_a_badger_garbage_disposal.pdfIn PDF document text
    • http://jugakob.pbworks.com/w/file/fetch/144941094/41434225669.pdfIn PDF document text
    • http://patimedudemu.pbworks.com/w/file/fetch/144698874/how_to_count_by_sevens_song.pdfIn PDF document text
    • http://supatibu.pbworks.com/f/justinas_marcinkeviius_mindaugas.pdfIn PDF document text
    • http://bopelijexuf.pbworks.com/w/file/fetch/144645156/87411511478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b85492c-0dc4-407e-8e01-394b440f0978/the_count_of_monte_cristo_2002_full_movie_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cde27ac-9b9f-4c8c-af4e-dae51b70f1ef/samsung_bd-jm57c_boot_loop.pdfIn PDF document text
    • http://numefen.pbworks.com/f/how_to_program_a_3m_filtrete_thermostat.pdfIn PDF document text
    • http://zevatirupura.pbworks.com/f/apex_learning_algebra_2_semester_2_quiz_answers.pdfIn PDF document text
    • http://favixose.pbworks.com/w/file/fetch/144537240/bo4_emblem_editor_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdb1cd94-6c9f-4b77-bd95-43db96600109/xubetalozajigixene.pdfIn PDF document text
    • http://xugilip.pbworks.com/f/fasadudanaxemosapatuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9df118b-3182-428c-9374-680eaed16421/30183694504.pdfIn PDF document text
    • http://sujagajo.pbworks.com/f/15_steps_to_freelance_illustration_depicts_homologous_chromosomes.pdfIn PDF document text
    • http://nipekari.pbworks.com/f/xegaridadalakalegi.pdfIn PDF document text
    • http://xejujaser.pbworks.com/f/filmorago_app_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5e6e17f-277e-4726-ae23-8b3a307b379b/porter_cable_ts056_manual.pdfIn PDF document text
    • http://sagidetubi.pbworks.com/w/file/fetch/144550734/wosikakobipexagagavilare.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6A 4940 bytes
SHA-256: c4c49504405d19a8ee47e614ad0261ee916cdb58481db5a356727fed4f96714c
font_01_sfnt_off0000fb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB20 11180 bytes
SHA-256: 5ab01189f3e821c3a35f482f68ddffeb2b21c16366c9b28d6a2b5dc4e459994e
font_02_sfnt_off00012139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12139 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
font_03_sfnt_off00012f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3B 10092 bytes
SHA-256: baa74d541c6dcb32ae967800223a2ef7d86836e921fd16852e1e9ce89d1ccb18