Malicious PDF — malware analysis report

Static analysis result for SHA-256 36817841c6a78bb9…

MALICIOUS

PDF

75.9 KB Created: 2021-06-07 17:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5c3eaed0c24bbdd77ead4930f492d1b8 SHA-1: 48bc595338735c756ca93f0702730558f0f9f6ee SHA-256: 36817841c6a78bb9438e7e2f2ddc4964c406e03e62c4da091dc5319ca215b82a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious or phishing sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the primary attack pattern is the deceptive use of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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.
  • 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://zajinet.ru/123?utm_term=bahubali+2+songs+video PDF link annotation
    • https://bamesejoporafuv.weebly.com/uploads/1/3/4/2/134265360/ruxulekudafom.pdfIn PDF document text
    • https://sunotutosa.weebly.com/uploads/1/3/4/4/134402565/1979433.pdfIn PDF document text
    • https://dovekawelefirim.weebly.com/uploads/1/3/4/2/134266448/fa689305ec67d0.pdfIn PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/8016b09967.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469645/normal_5ffe812cab224.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485450/normal_60b8dcdf56af2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416789/normal_604f165ff2ae3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xutosop.pbworks.com/w/file/fetch/144715698/cant_find_camera_on_android.pdfIn PDF document text
    • http://vawijoj.pbworks.com/f/8141080940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8905abf-b50c-4c56-aa45-247fcd4eb2ac/motepinavivokitutipazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e59a30f-0750-4ccd-8d95-90a0c992375c/libros_apcrifos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dd7c21d-b4a2-4a5f-94d5-0f81918280ae/wimagol.pdfIn PDF document text
    • http://lodenapokot.pbworks.com/w/file/fetch/144623355/83012386937.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be95ee59-9d8a-41c0-9351-5fde44a4b4f3/how_to_replace_sony_mdr-xb950n1_ear_pads.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79e8b026-1cc5-4de0-9ddb-673c84727f73/52782563832.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05fedabe-e316-45e5-bacc-84c2251d987c/how_to_turn_on_bluetooth_on_sony_car_stereo.pdfIn PDF document text
    • http://gamaxidad.pbworks.com/w/file/fetch/144534060/steel_truss_design_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7114465-78bf-4324-b64a-a426d8bc57cc/59487416502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4053851-4f29-430a-8d62-1b4ba1b25c0e/48303413735.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72e7baf1-89dd-41c4-afc8-d3a7d697269b/medios_de_produccion_capitalista_caracteristicas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64a6a4f1-c24d-4da6-a048-a09dabe7aaf7/wozavati.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_off0000eaa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA1 5372 bytes
SHA-256: 1f97cf3b5dabf2d290506c0000a77fc3cea90bd6ec55cf5b8f86d29643ecd5a8
font_01_sfnt_off0000fceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEB 11260 bytes
SHA-256: 8c306f5d32cbe5707e8280965bd0756dc78535bdd3990c173b20a807fe68b9ef