Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d249749dd64d82…

MALICIOUS

PDF

79.5 KB Created: 2021-05-31 03:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 09bc799e962b70f80c1348fd3d7c11ef SHA-1: 79356d5ee00351c9682c5df1a21f69899d6a3a5a SHA-256: b0d249749dd64d8281bba460160a3fcc864470639d71d9c99ef6e227a1141ce8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used to redirect users to malicious websites for phishing or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ponafet.ru/123?utm_term=libro+apostolado+de+reparacion+pdf PDF link annotation
    • https://josabinisepev.weebly.com/uploads/1/3/1/4/131452942/7f29cb04b02.pdfIn PDF document text
    • https://nodizolubuta.weebly.com/uploads/1/3/5/2/135297944/xigun-zojezu.pdfIn PDF document text
    • https://vimugowome.weebly.com/uploads/1/3/4/3/134323071/xazom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489041/normal_5fddce5960210.pdfIn PDF document text
    • https://lasasokuvob.weebly.com/uploads/1/3/1/6/131607269/diwatetubedivar-tavawiwiraraza.pdfIn PDF document text
    • https://jivafizet.weebly.com/uploads/1/3/4/7/134743279/2fed64a266ac285.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390383/normal_6057edd0db555.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447646/normal_601dd71940155.pdfIn PDF document text
    • https://neberesoz.weebly.com/uploads/1/3/4/5/134512227/xagetedafo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483388/normal_5fda77274996e.pdfIn PDF document text
    • https://besunuvoduzusub.weebly.com/uploads/1/3/4/2/134266379/2919038.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473023/normal_5fe16645b5366.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425915/normal_602eada619b61.pdfIn PDF document text
    • https://gokejaxax.weebly.com/uploads/1/3/6/0/136056436/1733361009116b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476007/normal_60400cbfd4a67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502436/normal_5fe7bdd00c564.pdfIn PDF document text
    • https://berovifis.weebly.com/uploads/1/3/4/7/134730871/3667928.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384149/normal_60686eb0b5ee5.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/ee64b94c-ebc9-4746-9e8b-239a37a9d9f5/moxunopofomavuriru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f4804a8-7715-4d74-9b5f-34034c446a86/libro_planeacion_estrategica_fundamentos_y_aplicaciones_idalberto_chiavenato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a15c448-4758-4e72-9af5-585957486d89/22998852221.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0f4e677-73c3-4d9b-b529-197ac5626a17/gorixuzafixudarivanafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b847d5c6-d30a-4478-8e70-c39e2a2f217d/instructivos_para_realizar_manualidades_navideas.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
stream_003_off0000f630.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF630 5228 bytes
SHA-256: 5fdf74066712938dfdbbae6ab1be284242e49b0f3dbdbae8662879a7edac001c
font_01_sfnt_off00010804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10804 11976 bytes
SHA-256: 4537cc9ae5c9571236f32b1e8abc282c3fe464a184c0719976c86b9706ce58fe