Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db87fffc5532ba1…

MALICIOUS

PDF

79.0 KB Created: 2021-03-22 10:08:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 124c6cc495c9b7b2c6b144726f0359c2 SHA-1: f5c56c8e2e0db751ae78a56e3f6c8958f92790f5 SHA-256: 4db87fffc5532ba180597ae9918a7c9419ea862cab5f85c488318d7cf4e50c6e
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of embedded URLs and the nature of the PDF_SEO_LINK_FARM heuristic point towards a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://botokaw.ru/123?utm_term=guess+what+answers+flipkart PDF link annotation
    • http://puliliraforuwu.22web.org/momentum_and_collisions_worksheet_answers_physics_classroom.pdfIn PDF document text
    • http://birebap.scienceontheweb.net/votugo.pdfIn PDF document text
    • http://fozasuwukoroba.iblogger.org/bodybuilding_routine_for_mass.pdfIn PDF document text
    • http://tizuboxewek.iblogger.org/epson_xp_320_printer_head_cleaning.pdfIn PDF document text
    • http://medesutaduj.22web.org/xadirofonidaro.pdfIn PDF document text
    • http://korezafegedim.22web.org/auslogics_disk_defrag_cnet.pdfIn PDF document text
    • http://bafiselavanebep.mywebcommunity.org/32494114589.pdfIn PDF document text
    • http://tisejamebip.sportsontheweb.net/antidiabetic_drugs_chart.pdfIn PDF document text
    • http://zelumefepa.sportsontheweb.net/sermones_expositivos_listos_para_predicar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/briggs_and_stratton_725exi_pressure_washer_wont_start.pdfIn PDF document text
    • https://18b62485-dce0-4e35-9712-b1d1f13fcb23.filesusr.com/ugd/296484_7591e5c81a6842c29675472e306453f0.pdf?index=trueIn PDF document text
    • http://wenibeliso.atwebpages.com/the_theory_of_relativity_and_a_priori_knowledge.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/tizigodofobefebuwosawe.pdfIn PDF document text
    • http://sitotozip.rf.gd/gross_and_net_weight_worksheets.pdfIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_62d93ca6eea444ab887293617a65ad07.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/45627084079.pdfIn PDF document text
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_d761e5b644e94cf8b8d308e69d5ad9dd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/innova_3040e_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/bobevinuxelu.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/personal_management_merit_badge_workbook_2018.pdfIn PDF document text
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_7961bcf1cf1847a9addc2bdb5a2527d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mudurixo/yahoo_login_app.pdfIn PDF document text
    • http://xixakoju.rf.gd/cashew_nut_health_benefits.pdfIn PDF document text
    • https://6e00f30c-c2f4-4f8b-b3fa-04142e93d3a6.filesusr.com/ugd/7b3c9f_f4653e1f30be46dcbc16c74815bc2e64.pdf?index=trueIn 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_off0000f6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CE 5176 bytes
SHA-256: ef64d1a57968155a7ab897eee2e66e0855ab7437e944e6abafa8694f0430b59e
font_01_sfnt_off00010879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10879 11136 bytes
SHA-256: 9a014341488908670bc6541194570247fc56d31baefcd8932bf12e23aba98b9a

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