Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d719a904a98b8c…

MALICIOUS

PDF

97.5 KB Created: 2021-04-08 08:40:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6d544189f26342ba1373f76ee26cda1b SHA-1: 558f1e8060f008e26df2222570a525053942ad57 SHA-256: c0d719a904a98b8c190b60600ee4827ad6dd4e84835ac34851b5a4e168783988
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/strik?utm_term=double+dapple+dachshund+rescue PDF link annotation
    • https://vumerajijo.weebly.com/uploads/1/3/2/8/132815742/tubugegarorajowapu.pdfIn PDF document text
    • https://kopudezazuxunob.weebly.com/uploads/1/3/1/4/131408344/vixitoxawudiwu.pdfIn PDF document text
    • https://devigejijakefu.weebly.com/uploads/1/3/2/7/132740662/9115280.pdfIn PDF document text
    • https://madugonado.weebly.com/uploads/1/3/2/8/132815119/742d4dd62b10e4.pdfIn PDF document text
    • http://dokaxirugik.medianewsonline.com/business_communication_today_global_edition.pdfIn PDF document text
    • https://xexalidifiso.weebly.com/uploads/1/3/4/6/134685587/mejodij.pdfIn PDF document text
    • http://powuvomewekuxeb.getenjoyment.net/el_poder_de_la_kabbalah_descargar.pdfIn PDF document text
    • https://gotenalonas.weebly.com/uploads/1/3/4/3/134372716/9817784.pdfIn PDF document text
    • http://jijoxep.getenjoyment.net/esl_appearance_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://matewedidoxeber.onlinewebshop.net/how_to_start_an_evaluation_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f2f178a-b235-4906-a539-78f9ac8992ea/ruvojofone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cc75cef-ec22-4ef0-b1a2-c09c212507da/when_would_you_use_inverted_commas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67c3f7ae-938b-40f2-8444-15314806ff88/8295954104.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/vifojusepekivigididonevaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9695ee7b-8544-4196-8013-be211d2e8b48/90923744489.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/bubble_trouble_flash_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf71512b-dd13-4547-a16a-233e13f0fce8/tewimuxamefepek.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/tiginamidalejito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee318b13-4835-40f6-bd41-5844cc8ab640/xutoxuvanorebiniwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee5b3ccb-601e-4864-adf5-5e3ba705d003/nelerumusufonetevemig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8969a207-f2bf-44f1-8aff-13bd40599570/where_is_the_newspaper_template_on_microsoft_word.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/hubspot_agency_partner_certification_exam_answers.pdfIn PDF document text
    • http://zugepoguj.onlinewebshop.net/analytical_reasoning_tips_and_tricks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0e379a3-1d7a-4101-87b2-e9d33f208564/16284822144.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2151b779-4d8a-4269-bfda-8d69a6a3156f/how_long_to_get_approved_for_pua_benefits.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12019 5392 bytes
SHA-256: 74fd9f6c8aa6b5f269748ce9401f2283a9ef663efb561984d6dbfc6c35e149f0
font_01_sfnt_off000132da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DA 5056 bytes
SHA-256: dec071ae10df1fad58f7a74f82c6805084d295a5d5687c10c9066f4443e1f23c
font_02_sfnt_off000143e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E5 11120 bytes
SHA-256: 050784869e7f820debdb3f8871d22a5a445cea02ad78c91296a19dfcc3b280bb
font_03_sfnt_off00016a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A01 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333