Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6003c645598ba13…

MALICIOUS

PDF

88.8 KB Created: 2021-06-06 14:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 00baec89aabaa4d05f2de0eabefa479e SHA-1: 206606fe9c451fb60d07a297d5e14375ce830135 SHA-256: b6003c645598ba133c9148da549bd2db75b642cb51247f231b1353ac79575f71
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically flagged as a potential phishing lure due to its UTM parameters and association with link farm heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external URIs suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9841

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://cructi.ru/pbw?utm_term=guia+del+consejo+tecnico+escolar+cuarta+sesion+2020+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500904/normal_6014fbb8a42f8.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4465250/normal_60b2df7c5783f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453333/normal_5fdef109d286c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477626/normal_5fde72f139c16.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://botinuba.pbworks.com/w/file/fetch/144414291/g_shock_g7900a_manual.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/w/file/fetch/144491634/nested_if_else_statement_in_informatica.pdfIn PDF document text
    • http://numefen.pbworks.com/w/file/fetch/144535215/nuzusowuvibepexizuwuto.pdfIn PDF document text
    • http://fevosezew.pbworks.com/w/file/fetch/144696555/the_dragonet_prophecy_series.pdfIn PDF document text
    • http://daxulesep.pbworks.com/f/daxulapovekaputum.pdfIn PDF document text
    • http://kirozatijawu.pbworks.com/w/file/fetch/144508674/les_diffrents_types_de_centrales_lectriques_existants_en_france.pdfIn PDF document text
    • http://dejulagimu.pbworks.com/w/file/fetch/144544167/compound_words_worksheet_with_answers_grade_5.pdfIn PDF document text
    • http://xixokuzujoz.pbworks.com/w/file/fetch/144427209/fuxifajejikog.pdfIn PDF document text
    • http://sejuworepow.pbworks.com/w/file/fetch/144610398/86769857648.pdfIn PDF document text
    • http://pobonagul.pbworks.com/w/file/fetch/144578502/97308835666.pdfIn PDF document text
    • http://punumiboxo.pbworks.com/f/duliruputori.pdfIn PDF document text
    • http://zewalar.pbworks.com/f/23463959019.pdfIn PDF document text
    • http://jaxonewu.pbworks.com/w/file/fetch/144642984/uniformly_accelerated_motion_physics_ppt.pdfIn PDF document text
    • http://tozuxexap.pbworks.com/w/file/fetch/144523644/internet_explorer_location_windows_8_not_working.pdfIn PDF document text
    • http://natizasex.pbworks.com/f/simon_vs_the_homosapien_agenda_audiobook_free_download.pdfIn PDF document text
    • http://lifelekufa.pbworks.com/f/la_voici_la_nuit_de_dieu_partition.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/w/file/fetch/144521775/zapuvutobenunup.pdfIn PDF document text
    • http://jejosuxiz.pbworks.com/w/file/fetch/144503175/digidikodokepari.pdfIn PDF document text
    • http://nonesupul.pbworks.com/w/file/fetch/144554721/mega_man_2_unblocked_at_school.pdfIn PDF document text
    • http://daridameku.pbworks.com/w/file/fetch/144592863/nipakejufinozuzopeluka.pdfIn PDF document text
    • http://nugurafuge.pbworks.com/w/file/fetch/144616980/what_type_of_intermolecular_forces_exist_between_ch3oh_and_h2o.pdfIn PDF document text
    • http://gosirata.pbworks.com/f/is_halo_2_compatible_with_xbox_360.pdfIn PDF document text
    • http://tejudafo.pbworks.com/f/mavadojegorigotususas.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 6744 bytes
SHA-256: 127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
font_01_sfnt_off0000fc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC33 5528 bytes
SHA-256: 7cccfbcbebb4f2935e3d8884701ff1398b51b9e14391d34a145e2bf17a215ff8
font_02_sfnt_off00010f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0E 1860 bytes
SHA-256: d5c8c7ab340a042f0d9f77a5c3536099069623ff72184d472d84e565ec18cd3a
font_03_sfnt_off000117d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D0 11460 bytes
SHA-256: d9839f59ed914f3d466884ef641405f3a5fbefa6b8ab402afdf7a5b0c44438d8
font_04_sfnt_off00013cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF3 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f