Malicious PDF — malware analysis report

Static analysis result for SHA-256 84705e309290a427…

MALICIOUS

PDF

74.1 KB Created: 2021-06-07 11:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9e0cb4fe1f54d87d52d7e41f28a9295d SHA-1: 21899d89cfe59ffa23dc3db5d2824b443897d5c3 SHA-256: 84705e309290a427afae6434bd2f9f83ada8a24f9a977952fcd8d3b399bc23b3
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with one prominent URL pointing to 'ketchas.ru', suggesting a phishing or malware distribution attempt. The PDF structure and heuristic firings indicate it functions as a link farm, likely to obfuscate the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/pbw?utm_term=kenshi+build+base+or+buy+house PDF link annotation
    • https://tajamexuzoxobug.weebly.com/uploads/1/3/1/4/131410736/3781845.pdfIn PDF document text
    • https://limezisetuf.weebly.com/uploads/1/3/4/8/134871661/8048743.pdfIn PDF document text
    • https://juwomazitebuden.weebly.com/uploads/1/3/1/4/131414743/9ef42bccb002.pdfIn PDF document text
    • https://lepenenaxagonu.weebly.com/uploads/1/3/0/7/130739126/zeropupite-pamixasuxasok-mojojobil-dojodawomomo.pdfIn PDF document text
    • https://xumipapabof.weebly.com/uploads/1/3/4/6/134609146/monasa.pdfIn PDF document text
    • https://nogisapu.weebly.com/uploads/1/3/1/4/131453993/7033712.pdfIn PDF document text
    • https://lapunowelozod.weebly.com/uploads/1/3/5/3/135337348/wofiwexiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mizunebapod.pbworks.com/w/file/fetch/144464691/online_shopping_project_ppt_free_download.pdfIn PDF document text
    • http://lebamojopa.pbworks.com/w/file/fetch/144582516/49449795935.pdfIn PDF document text
    • http://kemususi.pbworks.com/f/crochet_baby_hat_patterns_free.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/f/how_to_determine_the_cubic_feet_of_a_refrigerator.pdfIn PDF document text
    • http://davixezudi.pbworks.com/w/file/fetch/144644583/wovisig.pdfIn PDF document text
    • http://faxofapuf.pbworks.com/f/45879316855.pdfIn PDF document text
    • http://nomebazeregi.pbworks.com/f/zofexuxewazatijawelepiz.pdfIn PDF document text
    • http://rimogeto.pbworks.com/w/file/fetch/144732573/what_is_dl_44_form.pdfIn PDF document text
    • http://dejimebez.pbworks.com/w/file/fetch/144620460/arabic_calligraphy_books.pdfIn PDF document text
    • http://wigiwopajuke.pbworks.com/f/39254819829.pdfIn PDF document text
    • http://zorisomofi.pbworks.com/w/file/fetch/144554973/how_do_i_reset_my_rca_android_tablet.pdfIn PDF document text
    • http://tagexoba.pbworks.com/f/how_long_should_a_dyson_v10_battery_last.pdfIn PDF document text
    • http://jebusolole.pbworks.com/f/vocalizer_tts_voice_english_apk.pdfIn PDF document text
    • http://laxaxufudej.pbworks.com/f/quando_prendere_magnesio_mattina_o_sera.pdfIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144411714/how_to_use_coffee_pods_in_hamilton_beach_flexbrew.pdfIn PDF document text
    • http://jorowad.pbworks.com/w/file/fetch/144743856/internal_communications_plan_template_excel.pdfIn PDF document text
    • http://zawepiko.pbworks.com/f/qu_significa_la_palabra_redargir_en_la_biblia.pdfIn PDF document text
    • http://damopijos.pbworks.com/f/les_animaux_fantastiques_1_livre.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_off0000e5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DA 5124 bytes
SHA-256: 2b058c5f2dc51e98cbbe90b9888e0f48910acecca31cc680548c792f01415b64
font_01_sfnt_off0000f747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF747 10560 bytes
SHA-256: becaed1d4ff2b8e0a0794ab9848eed4d76fbb1d85e7337e452c80035d56f79b5

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