Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b928ebecf3f4cd3…

MALICIOUS

PDF

96.7 KB Created: 2021-03-11 06:34:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f7a43a736b8839eab4606eaedfaccc99 SHA-1: d0a01fc6dc222eb573fcb2d2b74bfa17e28a2a36 SHA-256: 0b928ebecf3f4cd31a4e4b0c13b53e1b7e908bf5e3459fc198559285074c6607
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing. The document body, though heavily obfuscated, appears to be a lure related to 'Estructura de estudios de factibilidad'. The presence of embedded URLs and the nature of the heuristics point towards a phishing attack aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=estructura+de+estudios+de+factibilidad PDF link annotation
    • https://cdn.sqhk.co/gegojagakexu/f9gcrUi/dominoes_game_set_pieces.pdfIn PDF document text
    • https://rekepepijo.weebly.com/uploads/1/3/4/0/134018016/6759223.pdfIn PDF document text
    • http://bekotuselol.22web.org/who_sang_the_bluest_eyes_in_texas.pdfIn PDF document text
    • https://laxepesijuniz.weebly.com/uploads/1/3/1/3/131383562/6315768.pdfIn PDF document text
    • http://tamakar.tech/download_facebook_versi_lama_apkpure67ce3.pdfIn PDF document text
    • http://weputurogaxefi.iblogger.org/96112025043.pdfIn PDF document text
    • https://cdn.sqhk.co/wisisatofife/YjmX9gj/pororilapokavetagadikiki.pdfIn PDF document text
    • https://cdn.sqhk.co/pawekenu/chjEiaV/86409590236.pdfIn PDF document text
    • http://cancandance.org/i_speak_six_languages_sheet_music_scribdnxv8o.pdfIn PDF document text
    • https://sakotitalivuvu.weebly.com/uploads/1/3/4/8/134887700/dabixew.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nudegew.rf.gd/what_is_the_meaning_of_phrase_much_ado_about_nothing.pdfIn PDF document text
    • http://ribizotujigotok.rf.gd/isolation_of_dna_from_strawberries_lab_report.pdfIn PDF document text
    • http://xutarefes.epizy.com/i2_analyst_notebook.pdfIn PDF document text
    • http://xugomoxuniwemo.rf.gd/94445119057.pdfIn PDF document text
    • https://s3.amazonaws.com/gatazeromij/how_to_buy_a_house_in_canada_with_no_down_payment.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/icao_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/josafudo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13353 1528 bytes
SHA-256: 68fc7b7a748f9af9722f74a362c3a817ea7369da6592dbd58f25ca1265c98c1b
font_01_sfnt_off00013b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1D 5112 bytes
SHA-256: 72b619046482783ee92877869752c869beff967eeb5bb7510175a4fb6c472618
font_02_sfnt_off00014c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C90 12120 bytes
SHA-256: 4dedb722812b0b2015aa1840207f63b038bf1b0bf68f4a5dca7250adaa95c05c

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