Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4b463df7db00b6…

MALICIOUS

PDF

83.5 KB Created: 2021-05-24 09:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9a1b526b259115364b4ec82d6ad44402 SHA-1: 0a126bf4ab18eee105f054f90e5c3650d892b0de SHA-256: ca4b463df7db00b6afd8159167b547eaf435eeb96ea882b0d7ac09e9dc6ec90f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://resalured.ru/strik?utm_term=cavaleiros+do+zod%25C3%25ADaco+alma+dos+soldados+pc+download', is flagged as malicious and likely serves as a lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/strik?utm_term=cavaleiros+do+zod%25C3%25ADaco+alma+dos+soldados+pc+download PDF link annotation
    • https://jadufebifov.weebly.com/uploads/1/3/4/6/134627690/7050823.pdfIn PDF document text
    • https://davufafelasipip.weebly.com/uploads/1/3/4/3/134328138/lomemowajovun.pdfIn PDF document text
    • https://valiwuvubeke.weebly.com/uploads/1/3/4/6/134694219/sepuvinojugo-puzexojaxi-benafekojire-lovonadagunil.pdfIn PDF document text
    • https://pigaxapi.weebly.com/uploads/1/3/2/8/132815084/jilavowi_suwerok_jabowoxuzutoruj_jijikatolino.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
    • https://uploads.strikinglycdn.com/files/37207369-e8fe-4e8f-95b4-a546a9f4a990/46688882557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/107c65c9-4287-4212-aaad-6dc69e4c8a86/75359372692.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/arizona_attorney_general_will_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/78167367101.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/verbos_irregulares_en_pasado_participio_ingles_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/what_can_you_do_with_a_health_economics_degree.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/86418537341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7461b4d-dfd2-4817-904a-396efa4deb12/marketing_communication_planning_process.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/diocese_of_scranton_abuse_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56233929-6adc-4d56-998e-e100091cdc3f/75520570840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77f226ec-0707-4c53-addb-6ec7ee11da0f/wileyplus_intermediate_accounting_chapter_15_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cf1021b-1c5b-42e3-9b6d-9d948606b0a2/gotolowoxikamugera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/168563e7-d176-4380-b325-de7dd9f6b847/79291750971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9653eefc-1929-46b1-a651-6c40b068618e/singer_6235_oiling.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_off0000e978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE978 5204 bytes
SHA-256: 9db00abb2c7a1733e4884215de86efe0523bc9c3a2138415f214b7c041c5807b
font_01_sfnt_off0000fb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 3024 bytes
SHA-256: f271277bc92c8ec255f016eb89af31946ace6cee13b85d2ca72bafc089855a25
font_02_sfnt_off00010659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10659 13944 bytes
SHA-256: 374b89cd0ea01e39ec2d196f103e64ccd0bfe72a6d1305529c71e649124b40f2
font_03_sfnt_off00012f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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