Malicious PDF — malware analysis report

Static analysis result for SHA-256 24bed3f2133e9be2…

MALICIOUS

PDF

73.8 KB Created: 2021-06-13 12:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 66a8a46d78772e7b73fc5df521bdddb4 SHA-1: 5492467e3ee1ed2f8f538a02631b349ca214554e SHA-256: 24bed3f2133e9be223d66f0ae467f2f2ca57c4caf1832580dad98c9406f1c117
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' containing 30 external links. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs and the PDF structure suggest an attempt to redirect users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • 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://irlanc.ru/pbw?utm_term=linux+basics+for+hackers+getting+started+with+networking+scripting+and+security+in+kali+pdf+download PDF link annotation
    • https://wisiwojapano.weebly.com/uploads/1/3/4/8/134896472/fafadedevu-favuguji.pdfIn PDF document text
    • https://vulabomanuxuw.weebly.com/uploads/1/3/4/8/134857085/vivotajugazijazo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406191/normal_60bc75e90fccf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389084/normal_5fe03505b0aa8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464521/normal_5ff55067468d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476566/normal_5fd5feccc0a57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368466/normal_606e16e0a107d.pdfIn PDF document text
    • https://kumexaper.weebly.com/uploads/1/3/4/8/134882622/nikapo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421061/normal_5fe075bd18acc.pdfIn PDF document text
    • https://surewiseg.weebly.com/uploads/1/3/4/4/134465661/de13023714529.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374852/normal_6006fc533bbaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382414/normal_605f3ab71801f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388040/normal_606800ef63b12.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8b418a1-8ad8-4d89-a8b8-d624329af4c1/tanomim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbb2aee0-c7ce-46d1-9272-d33b74bf37b7/35353499143.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c10dc8d2-2705-4aa0-92d8-295f2cbbbc28/onkyo_tx-nr515_arc_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5111bb25-f8e3-4962-bce5-bc29568ec3de/23944262067.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43e5f733-7a51-4cfd-b7f9-eaab701a57c7/reflexive_verbs_spanish_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e8d4b4b-c916-4652-b1de-bcc496b643bb/godetejuxulawosakezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a53de9aa-a046-4ece-9e3f-456e08621e26/kolenabikulogivukir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7111fb7b-44f0-48fc-afd9-be830efc8582/usa_jobs_information_technology_specialist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36d27b58-682d-4545-b99a-578ca5a7b44f/lincoln_electric_weld_pak_hd_180.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67af241b-ae9c-49d5-8daf-a27c6d5a0fc0/60655120621.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_off0000e2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E7 5824 bytes
SHA-256: 2de31a40b63970a230a56a474f5c287ad2c38c19e7725194fa0ee5b63db63419
font_01_sfnt_off0000f6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D3 9920 bytes
SHA-256: 1fb3d2432f386df699f49f2e2c30e5aa62b1a9b7146d61a3592bff40fe39f209