Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28ffe55dc541a5c…

MALICIOUS

PDF

84.3 KB Created: 2021-05-08 06:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34793a692207dce1ec173023765a4530 SHA-1: d6182ed265f47066809c78e48aaf41a52ccd988e SHA-256: c28ffe55dc541a5c258ca949307dab036f9423ff25792bc183c9960198020804
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, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to multiple disposable domains, with one URL specifically pointing to a potential phishing lure related to 'Patriarcas y profetas capítulo 17'. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/strik?utm_term=patriarcas+y+profetas+cap%25C3%25ADtulo+17
    • http://picply.ru/george_foreman_grill_cooking_times_chartf0qqt.pdf
    • http://bestita.space/dunkin_donuts_iced_vanilla_latte_carbs2jlxu.pdf
    • https://cdn-cms.f-static.net/uploads/4501632/normal_6030aa636b579.pdf
    • https://gipavenox.weebly.com/uploads/1/3/5/9/135966662/8779013.pdf
    • http://lnstagram-helps-contact.com/nintendo_wii_rvl-001_blackgs0yv.pdf
    • http://usmileofficial.site/lmwh_reversal_guidelinesdnkmn.pdf
    • http://merovuvokevilil.iblogger.org/anandabazar_patrika_today_news_in_bengali_language_page.pdf
    • https://tuvukorop.weebly.com/uploads/1/3/1/8/131857527/1d7ccd9d88d4.pdf
    • https://fimosezit.weebly.com/uploads/1/3/0/7/130775491/vozuju-razufeteruv-ditovev-xuwuvam.pdf
    • https://cdn-cms.f-static.net/uploads/4404520/normal_601aa00a04ac7.pdf
    • http://hookup666.site/escribir_una_receta_de_cocina_cortaschmb.pdf
    • https://cdn.sqhk.co/luwesefizi/0vml3ge/conquest_starion_for_sale.pdf
    • https://wajadotufa.weebly.com/uploads/1/3/1/8/131857144/dipavurumofi.pdf
    • https://cdn.sqhk.co/givesaxi/hcgjihf/trap_bunny_bubbles_tiktok_song_name.pdf
    • https://cdn.sqhk.co/rekewuneboxu/idAhhYK/jutelowe.pdf
    • https://cdn.sqhk.co/rifibimilo/icKhajj/sql_database_interview_questions_and_answers.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/genijusemu/learning_english_worksheets.pdf
    • http://jaguradimesarut.epizy.com/58885823223.pdf
    • https://s3.amazonaws.com/wemazun/vofugol.pdf
    • http://sewoxoxitif.rf.gd/amman_devotional_songs_tamil_free_tamilwire.pdf
    • https://s3.amazonaws.com/fexuror/full_form_of_lolo.pdf
    • https://s3.amazonaws.com/jonora/best_stock_books_to_read_for_beginners.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f999.bin
f09e2d90acc14cf91438fea5ecbf9dd5b2356621227d1bd8c46c4214151c15f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 5072 bytes
font_01_sfnt_off00010b09.bin
f264eddc17bdfe3b87c3deb68a756504872df17da79a9a57b07db395c3f00e5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B09 12780 bytes
font_02_sfnt_off00013391.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13391 4324 bytes

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