Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d74f46d94a8de9…

MALICIOUS

PDF

78.8 KB Created: 2021-04-07 04:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9921dc429d67ab9506131e9bae3a6851 SHA-1: eb0d455a56a4a0c9096019faa906c9a254b2e72d SHA-256: f6d74f46d94a8de919e488ac368497dae74548e27d00cde21e1c1bf4eb4c0abd
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting a phishing or redirection scheme. The presence of external URIs and the overall structure strongly suggest an attempt to direct users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/strik?utm_term=amor+en+tiempos+de+colera+pelicula+netflix PDF link annotation
    • http://reduslimitaly-ufficiale.site/kabudikamikixarebosr1dwk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378404/normal_5ff016d1d914e.pdfIn PDF document text
    • http://bajifepeselok.sportsontheweb.net/blitzscaling_download.pdfIn PDF document text
    • http://xifuponek.iblogger.org/mowenukakisoda.pdfIn PDF document text
    • http://larts.digital/233715787445dujs.pdfIn PDF document text
    • http://nikecortez.net/what_is_greek_religion_beliefsui3tf.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/are_they_making_another_mortal_instruments_movie.pdfIn PDF document text
    • http://noxopadorilu.iblogger.org/dizefot.pdfIn PDF document text
    • http://gejejasofubi.mywebcommunity.org/40765812252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451755/normal_605a9720e4fca.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/biology_chapter_24_introduction_to_animals_study_guide_answers.pdfIn PDF document text
    • http://216tilford.com/what_is_the_message_of_the_ones_who_walk_away_from_omelasx4j5a.pdfIn PDF document text
    • http://zumanidoxup.medianewsonline.com/bank_of_america_forms.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443823/normal_6001311fcd744.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403816/normal_606c1450d5634.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_f7455c8028f24b798cc1e5b816621cb9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/first_grade_reading_comprehension_worksheets_common_core.pdfIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_6d571dc9165c4c85826aed08dc7344ec.pdf?index=trueIn PDF document text
    • http://mofebuxigonewo.epizy.com/tarudaxemerobasisomuma.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/feedback_on_training_template.pdfIn PDF document text
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_7829b74a7f9942a6b635a192b6ae9c4c.pdf?index=trueIn PDF document text
    • http://genenapukiral.epizy.com/emulators_to_play_android_games_on_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/20795734640.pdfIn PDF document text
    • http://novotufimaxanu.epizy.com/37233685348.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/79006205399.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_off0000f1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BB 5360 bytes
SHA-256: 83f291a2db4804d7f446be36aebcd60fcd16f293f2271f3a2789e6891326cb6c
font_01_sfnt_off000103e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E2 12204 bytes
SHA-256: 3f965b7e4ea18af1389db9a4d23ca0420abf5dcb6a6334867cd07f82097c7e68

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