Malicious PDF — malware analysis report

Static analysis result for SHA-256 5529551d72fbd41e…

MALICIOUS

PDF

74.5 KB Created: 2021-05-27 19:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 725ea5fd7a3cc77f53d57afb7fb3db01 SHA-1: 22df838535634efe413455fd89766cf4b4353ae5 SHA-256: 5529551d72fbd41eb2474fcf626dc2313ccfd55212c6cc5911bdec98c806a909
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

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/strik?utm_term=8.+s%25C4%25B1n%25C4%25B1f+soru+bankas%25C4%25B1+%25C3%25B6nerileri PDF link annotation
    • https://ruwivogisi.weebly.com/uploads/1/3/4/2/134265822/ladaviwunovu-vivesimesu-movisinabog-kadometiwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367645/normal_5ff2492c39c2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402032/normal_6017f6fc5154a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471096/normal_6057cdd8b89d3.pdfIn PDF document text
    • https://panujiwawavila.weebly.com/uploads/1/3/4/4/134457592/420605a6eaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465555/normal_604ae98241528.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425909/normal_60414f86ee07f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424043/normal_60698951bb00d.pdfIn PDF document text
    • https://derodukiv.weebly.com/uploads/1/3/1/4/131453370/laxeputomuxode.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505820/normal_603a03c7bd9cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450160/normal_60013879a44ed.pdfIn PDF document text
    • https://luzepomi.weebly.com/uploads/1/3/1/8/131856518/pijizotujevek.pdfIn PDF document text
    • https://divoguwobumiwes.weebly.com/uploads/1/3/4/4/134487338/judovojetedazu-zivev.pdfIn PDF document text
    • https://dikodaselafilug.weebly.com/uploads/1/3/4/1/134108642/4245655.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/aeaf282a-c3a7-4857-a7b3-5a9a3f485e01/youth_bible_study_lessons_and_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bab87d95-fc10-48d7-a102-346ef7b619cc/how_to_render_scott_robertson_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d483d086-7fc3-4a0d-b94d-5bbb0b4d96b1/libro_de_texto_sexto_grado_espaol_sep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65edddbf-8997-4d0c-9712-70c35624fb47/45750065161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e790be5-1633-4e17-a078-61c35c36236b/how_to_heat_up_my_pool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38ff24e8-b446-4f0f-ba9f-cd7a8fb7e7ea/48350621497.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5006bb82-8e38-478c-b028-697b0298f6f6/nekiwotojuserivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ca830ae-850c-4c76-8b4e-c42b6f94ce58/32466335732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/184fe5d5-0eac-4325-9896-88ed537a0761/zirik.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_off0000e201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE201 5268 bytes
SHA-256: 05f0a7e57b813735535cafd3befd8eb74ad6f320a299ca1b40b30e1770d9d4d7
font_01_sfnt_off0000f3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C3 12540 bytes
SHA-256: 3c61030b9b59e3b71f1b6c36c2818c884e35a48424fd9fb0a5b9f039220152f9