Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30e28900f4dd5df…

MALICIOUS

PDF

96.7 KB Created: 2021-03-15 15:26:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2a837086f5ff5e32a9d64c3e0a3314ca SHA-1: 0b8cb79d2ec0c7c6ad314c3897d5b997ecae51f0 SHA-256: a30e28900f4dd5df0ead5afdd48dfd8bd2a5a845f9ecce77272dabf373c07595
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one specifically identified as a malicious external URI. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a compromised site.

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://zajinet.ru/award?keyword=undestanding+machine+learning.+from+theory+to+algorithms+pdf PDF link annotation
    • https://foxidaxoluw.weebly.com/uploads/1/3/4/0/134016742/5573a8546.pdfIn PDF document text
    • http://pigozolifafaw.iblogger.org/compare_apples_and_oranges_expression_meaning.pdfIn PDF document text
    • http://juniwasobevi.22web.org/sample_newsletter_templates_for_preschool.pdfIn PDF document text
    • http://nagetav.22web.org/burlington_ontario_weather_report.pdfIn PDF document text
    • http://kedejusofapirej.22web.org/bootstrap_html_admin_template_free.pdfIn PDF document text
    • http://mufapalufupezas.iblogger.org/debezab.pdfIn PDF document text
    • http://remoliwagofaju.mywebcommunity.org/difference_between_windows_and_linux_operating_system.pdfIn PDF document text
    • http://pesizememol.22web.org/danedufajusoz.pdfIn PDF document text
    • http://sifaritube.sportsontheweb.net/defozufevazavijamikolax.pdfIn PDF document text
    • https://tokafiwunan.weebly.com/uploads/1/3/4/3/134372509/kojuwiruzujupes.pdfIn PDF document text
    • https://mekupefaju.weebly.com/uploads/1/3/5/3/135316310/bimabalizomenaxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://levaduru.epizy.com/22023302852.pdfIn PDF document text
    • http://virefixifefuke.epizy.com/proportional_relationships_worksheet_answer_key.pdfIn PDF document text
    • http://jakosorer.epizy.com/mechanical_engineering_handbook_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/72971933260.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/jumpsuit_with_corset_plus_size.pdfIn PDF document text
    • http://puwodadivuxasaf.epizy.com/example_of_apa_format_annotated_bibliography.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/nafelaf.pdfIn PDF document text
    • http://xeziredo.epizy.com/cant_help_falling_in_love.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/test_direction_examples.pdfIn PDF document text
    • http://fepujusarif.epizy.com/comparative_and_superlative_adjectives_chart_worksheet.pdfIn PDF document text
    • http://rabelinowizufe.myartsonline.com/what_is_the_best_toilet_seat_bidet.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_off00013b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B19 5692 bytes
SHA-256: 02824bf8d5ab9968df2779057b0ccaf6afa3f49c2f9ff0cc6430fe9a441242cb
font_01_sfnt_off00014e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E66 12244 bytes
SHA-256: 418070dfb9b874e2b3f67dd4ed0fd858b19ec88e35cadf2e4a5489b958f481d6

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