Malicious PDF — malware analysis report

Static analysis result for SHA-256 da436bf1a5db9d1b…

MALICIOUS

PDF

75.7 KB Created: 2021-04-25 12:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 213ad8ca1af1850719f0d5060f52c332 SHA-1: d00672159cc466fe3f64b3102de3609312f88a94 SHA-256: da436bf1a5db9d1bc9deee072e4959f9b9bbaef35b2b380910182afbfb811955
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 a large number of embedded URLs, many pointing to disposable or unknown domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to wkhtmltopdf, indicating it was likely generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9752

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://golowaki.ru/strik?utm_term=como+hacer+amigos+e+influir+sobre+las+personas+ensayo PDF link annotation
    • http://kozugufasuroti.mygamesonline.org/canara_bank_debit_card_application_form.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384029/normal_5fff53aea52fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469860/normal_6033fa4c192fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369905/normal_60467a711708e.pdfIn PDF document text
    • https://cdn.sqhk.co/gegatuzikat/n4wjcge/15587586548.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/how_to_read_music_for_clarinet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446151/normal_5ff506ed55ef4.pdfIn PDF document text
    • http://manovina.mypressonline.com/calendario_2020_con_dias_festivos_oficiales_mexico.pdfIn PDF document text
    • http://gopudumimipabol.mypressonline.com/laser_absorption_spectroscopy.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/zevomobixigoderaliw.pdfIn PDF document text
    • https://cdn.sqhk.co/mewoveri/tOVjdBt/25153711685.pdfIn PDF document text
    • https://cdn.sqhk.co/kinerufi/gejf6ig/zombie_apocalypse_survival_movies.pdfIn PDF document text
    • https://cdn.sqhk.co/sosobigawe/jgchaij/insta_bokeh_blend-_square_blend_camera_photo_editor.pdfIn PDF document text
    • http://pisumuvate.sportsontheweb.net/14741375497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384851/normal_6017615758daa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_f23a1a7fcf2744fc824736fad85ac2c7.pdf?index=trueIn PDF document text
    • https://f92484db-e5b4-41f8-9431-508412042773.filesusr.com/ugd/b04c15_ea6182b7e2294f1e9737929b1c19ce58.pdf?index=trueIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_7895e8e764674be1bc7849d40af28835.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/12083b80-1e4a-4d6d-92f7-464eab00a8ce/kanekisanutaxobob.pdfIn PDF document text
    • http://dozopedatofol.atwebpages.com/adosphere_4_guide_pedagogique.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f1de4cf-a9a7-4a2a-8260-3bc57cecb932/furikez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dda282c1-7d56-46ce-8e46-7f14af1555ed/gibujegapilikinegitire.pdfIn PDF document text
    • http://tijuvewoduga.onlinewebshop.net/asexual_vs_sexual_reproduction_advantages_and_disadvantages.pdfIn 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_off0000eefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFA 5576 bytes
SHA-256: a9ca4eda9bdc8732bb72bb6b85f6ccb09dd1c4f1b8bd04435c2bcc77298e3178
font_01_sfnt_off000101cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CC 12096 bytes
SHA-256: 9f84db53a1cca3f879bd81ba5ce3ceeefd325c1621fc652c968af05ece66676d

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