Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc6e47aef1993b0…

MALICIOUS

PDF

82.4 KB Created: 2021-05-28 20:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bd79bca1bb61d1ae97d2030ed104d9a9 SHA-1: b66e59361e83e6dc81c9db9e4c811656f00aac1f SHA-256: bfc6e47aef1993b042951856aff8d4fbd137d18c5442c30890f35d9e60b6777b
186 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing or malicious content distribution scheme, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. It contains numerous external links, including one pointing to 'https://kuzutuzo.ru/strik?utm_term=bahubali+2+telugu+full+movie+hd+free+download', suggesting an attempt to redirect users to potentially harmful websites. The ML classifier and ClamAV detection further support its malicious nature.

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://kuzutuzo.ru/strik?utm_term=bahubali+2+telugu+full+movie+hd+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453908/normal_60414b6319b43.pdfIn PDF document text
    • https://xufevojulan.weebly.com/uploads/1/3/1/3/131384667/jaxow-wexuzurupin-bivunir-zapeje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386091/normal_60430c7d5b7d8.pdfIn PDF document text
    • https://pofimutazotoxo.weebly.com/uploads/1/3/4/0/134000188/ripori_nasabopil_bitivi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490950/normal_6055a0575bb86.pdfIn PDF document text
    • https://milonotupilo.weebly.com/uploads/1/3/5/3/135347339/5ada0.pdfIn PDF document text
    • https://vojiviroli.weebly.com/uploads/1/3/2/3/132302855/tefulejajekilodulaw.pdfIn PDF document text
    • https://febelozo.weebly.com/uploads/1/3/4/5/134599394/07f7508e13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485445/normal_6037bccd63103.pdfIn PDF document text
    • https://fawirato.weebly.com/uploads/1/3/5/3/135392883/tinozeroxuna.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390095/normal_5ff113aab4316.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/34de6d46-855b-470e-8fdf-1c3e9530f3bb/3822255250.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea937d69-28c6-4581-98cb-b51f9d936793/52393247019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62cfdd9f-77fd-4329-a2dd-128faf7a108d/plato_symposium_translated_by_robin_waterfield.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37b2012a-80b0-4a24-ae2f-4daf7fe37563/16778310253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25cc5696-ee84-4ecf-9c19-e51b49aa24b2/56213823110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c24d2d4-dbc5-43f5-9c94-e834e2c6ef60/el_mundo_de_sofia_resumen_de_todo_el_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeff797f-9cba-4eab-aa2f-f6b342f51a7f/what_is_autocad_for_civil_engineering.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8c234cf-8fce-40b0-911b-d48db665999c/53238273815.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b5d7bda-60e6-4e9a-89c0-644605f508e8/24183639454.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF01 5616 bytes
SHA-256: 8b052537540bdd22e74e0c15eceaa1f4bc8b9887f199b82b92eb03d2010440b3
font_01_sfnt_off00010209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10209 10648 bytes
SHA-256: 4a7e1439a521396dc59a5eec878096d0a79cbc82155fb02411b78ec1af9a3f30
font_02_sfnt_off00012688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12688 16164 bytes
SHA-256: 6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3