Malicious PDF — malware analysis report

Static analysis result for SHA-256 af15c5ab4da84797…

MALICIOUS

PDF

77.9 KB Created: 2021-04-03 03:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5d6dbd9bb8713476a1073b59803e372 SHA-1: 9eff59147fa94c930c30f140fabd66f849629c9e SHA-256: af15c5ab4da847977077c5663c6b2ab6ee4257fe978b562f1ac47a649cb9effe
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting a link farm designed to attract traffic or spread malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/award?keyword=descargar+guia+de+camping+espa%25C3%25B1a+pdf
    • https://cdn.sqhk.co/pejibuti/nsX9uJA/91771398639.pdf
    • https://cdn.sqhk.co/wepiwojeta/njQ8gia/sonic_adventure_dx_gamecube_save_file.pdf
    • https://cdn.sqhk.co/rolileduvof/hehhjiQ/ronakelapeseg.pdf
    • http://zomoxesami.22web.org/masters_performing_arts_college_london.pdf
    • http://nuxemuxexajimo.22web.org/59359374940.pdf
    • https://cdn.sqhk.co/baxafapunubi/GggjiVn/joweledinepek.pdf
    • https://cdn.sqhk.co/wawabosamugo/SeihRhh/84266431279.pdf
    • http://totevev.22web.org/burger_king_gutscheine_september_2020.pdf
    • https://cdn.sqhk.co/xufatirumina/eWlibM1/anoka_county_property_information_gis.pdf
    • https://cdn.sqhk.co/jarutejip/TDWifcq/directv_now_cost_per_month.pdf
    • https://cdn.sqhk.co/bimolixumotu/gheyzhg/zexunegiza.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b3e719cc-30df-460f-a5cd-d2fa480fcfac.filesusr.com/ugd/b2b6a5_c8c73c24c71943739cc2f5a17796b806.pdf?index=true
    • https://s3.amazonaws.com/gorajikunobixi/18745600190.pdf
    • https://7043ee2c-bc2d-4d46-b82c-b0075177c1aa.filesusr.com/ugd/f862b5_2f77c764dbed448c9d616ad6f6324d9b.pdf?index=true
    • http://lakowederegono.epizy.com/56052146432.pdf
    • https://s3.amazonaws.com/kubafezin/enthalpy_change_definitions_reactions.pdf
    • https://uploads.strikinglycdn.com/files/d1d70b5d-ceef-426f-a8b5-c5744be09f2b/dd_3.5_expanded_psionics_handbook.pdf
    • https://uploads.strikinglycdn.com/files/42cc251f-e947-4840-a9ef-25f5ff7001b7/fefagasitaz.pdf
    • https://uploads.strikinglycdn.com/files/a253e39d-ce19-4526-a267-f06a27e75a49/stats_modeling_the_world_ap_edition_4th_edition.pdf
    • https://s3.amazonaws.com/dotivaf/753071325.pdf
    • https://s3.amazonaws.com/tojabixefova/xokezalu.pdf
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_350fc45e94ea480d8932554f3de98907.pdf?index=true
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_1cc04125766748c2a2e977bde38342ce.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4ba.bin
e637a568ccd86a699ff29bcddfd0690f30fd435cc3acd355e0f27fb92e01f6df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BA 1668 bytes
font_01_sfnt_off0000ed09.bin
414bcf134e4919001344308abb577e22543b633fe74fa6c22362fbdc84198aba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 5656 bytes
font_02_sfnt_off0000fff9.bin
157ab73bfbb7cf5a9e9b9a9c1cd10a08f633f500725adfe944202163d9c03431		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF9 12100 bytes

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