Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe1e65027dd5b4b…

MALICIOUS

PDF

79.5 KB Created: 2021-05-31 20:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 99e1364d1344f9f553815f532d13e8e1 SHA-1: 59401f7057e92c638896727e65eae02ee12590db SHA-256: fbe1e65027dd5b4b304bf3e6923e50f97000d383ee7996a77b508718ccf6a5b7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URL points to a site that likely hosts a malicious payload or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/pbw?utm_term=punctuation+solved+exercises+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4494877/normal_5ff208c7d9002.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413867/normal_602f275882be4.pdfIn PDF document text
    • https://nenuvive.weebly.com/uploads/1/3/1/4/131483155/8092919.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389384/normal_601d24d68ce95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384461/normal_5fd9f48b17dcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461497/normal_6024286dcbbff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369308/normal_60243a59cb838.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410679/normal_5ff8f1328c7b4.pdfIn PDF document text
    • https://dolomepo.weebly.com/uploads/1/3/4/3/134355842/ranet-taduzikuveme-redapu.pdfIn PDF document text
    • https://vosuxawa.weebly.com/uploads/1/3/1/1/131164537/kenutewunoravotixeva.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/55875b80-5401-4e7d-a7a3-0ca4533c80a3/operating_system_concepts_9th_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8ad4193-d183-4887-8e80-fbcdb964c9f2/zaginavekaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ede13ee-aea4-42a1-b3cc-45bef2e3e5f7/jerixinanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d4d258d-61bc-4932-828b-060b769a70f1/25225327980.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b576e877-b40f-4a2f-90b9-ab810ccb00fc/90336003616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0838c06a-929d-458e-8a5f-86b6783ad2d4/balance_de_materia_y_energia_ejercicios_resueltos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/011291f4-015e-40ef-b507-bf6c1be55fc1/durga_stuti_13_adhyay_in_hindi_by_chaman_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c172720f-3c02-4baf-9e8e-cf48c2f4f092/sundance_spas_model_maxxus.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_off0000f71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71E 5280 bytes
SHA-256: fdeb77e129831e0311dd8f1c251234343df034328a685ee916fc95a8a73942fd
font_01_sfnt_off0001092f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092F 11224 bytes
SHA-256: 14e4ce0e76ec4b19c88cb5ccdb6ba786956c8a756389a57418275ae729c94c22

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