Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb66ed88fe8a960…

MALICIOUS

PDF

81.0 KB Created: 2021-04-19 12:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: de7ef4676a928cad45d9d6ab8e1516cd SHA-1: cef8966a1090e55a47cc569a69b824f3df9cd357 SHA-256: bfb66ed88fe8a960f0a110944ad46b9b5caaa7d5d31a62d8dc8d6efa98defa67
66 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://botokaw.ru/strik?utm_term=what+is+development+in+art PDF link annotation
    • https://kesaroxet.weebly.com/uploads/1/3/0/7/130775747/noravuzaviru-xikakuwelelawip-lavikoxabagof-niwejili.pdfIn PDF document text
    • https://xuwosanilenerev.weebly.com/uploads/1/3/4/9/134900173/kebadaduzebenut.pdfIn PDF document text
    • http://vash-fasad.live/grundfos_circulation_pump_manualh8n7e.pdfIn PDF document text
    • http://dogolojowazovuf.iblogger.org/usgs_topo_maps_online_free.pdfIn PDF document text
    • http://1gusevshop.space/mr_potato_head_parts3og66.pdfIn PDF document text
    • https://noberewesuxo.weebly.com/uploads/1/3/1/3/131379636/vobemuminajiw.pdfIn PDF document text
    • http://zhigina.ru/76387329181p91mq.pdfIn PDF document text
    • http://levelupguild.com/clasificacion_y_caracteristicas_de_las_cuentas_de_ordenqb2rc.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/99986608431.pdfIn PDF document text
    • http://potuxoposutu.medianewsonline.com/aprendizaje_basado_en_problemas_en_medicina.pdfIn PDF document text
    • http://bixaxivajujojar.mypressonline.com/resakitidisovijiwabivaze.pdfIn PDF document text
    • http://retamos.mygamesonline.org/92147909442.pdfIn PDF document text
    • http://fevozogu.iblogger.org/catastrophe_theory_arnold.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
    • http://zotinebid.epizy.com/wujitade.pdfIn PDF document text
    • http://kulinikono.epizy.com/alternating_current_machines_by_puchstein.pdfIn PDF document text
    • http://ginowane.onlinewebshop.net/wutigoduxo.pdfIn PDF document text
    • http://tujuzenu.epizy.com/84505530842.pdfIn PDF document text
    • http://vukabufe.epizy.com/actividades_de_matematicas_segundo_grado_de_primaria_para_imprimir.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09A 5060 bytes
SHA-256: 98e268e232fc2ecf1c58359642ed0fb76cced2917c8763164c1c44917eb6ba6a
font_01_sfnt_off000101aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AA 11136 bytes
SHA-256: 4e01db529565c7607e51f0faa38b48a2db0703a86d1391a0f790fca3b42201a8
font_02_sfnt_off0001276b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3