Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df77dbd7656bc15…

MALICIOUS

PDF

84.1 KB Created: 2021-04-06 14:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 09f5f38558529efadc8ede01d88ce5c5 SHA-1: 75b081559b08164215bc7a0eb7b02a501f32d693 SHA-256: 7df77dbd7656bc1537540e976f9da9105e08673b53d73d0b75326c536b196cd3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic flagging it as a link farm on disposable hosting. The presence of external URIs and the ML classifier output strongly suggest a malicious intent to redirect users to potentially harmful sites. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • 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 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://soxebez.ru/strik?utm_term=dragon+rampant+gules PDF link annotation
    • http://mawosatejojeka.sportsontheweb.net/ibps_clerk_2020_official_notification_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443803/normal_5fd7de3f00632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464865/normal_6056721e960ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490720/normal_605a612e70f5f.pdfIn PDF document text
    • http://woxijakuzadajew.getenjoyment.net/what_was_the_iron_curtain_during_the_cold_war.pdfIn PDF document text
    • http://zuxekagapefe.mygamesonline.org/52202114782.pdfIn PDF document text
    • http://kemamibuke.mygamesonline.org/how_to_glitch_through_walls_dayz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418981/normal_603255cc34ee8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411273/normal_6022ce3848211.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480582/normal_60090dbbea441.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494891/normal_5fef344c0262f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472182/normal_5fff605a184a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417824/normal_5fffb374c913e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/nefibubuzapuxem.pdfIn PDF document text
    • http://kuxatirimupuv.rf.gd/cuanto_equivale_metro_cubico_en_litros.pdfIn PDF document text
    • http://pijefekogol.rf.gd/23274446644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cab8763-db36-4fd6-9856-af261e224b54/is_arbys_meat_real_beef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8a58d66-b483-452b-b8ce-5a03bd67f4a7/diary_of_a_wimpy_kid_film_rodrick.pdfIn PDF document text
    • http://wogenulelo.rf.gd/137291119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a880455-e370-42e4-af34-6d15c34691a9/xelizowalovuvoguxum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d0d261d-95b6-46de-bc1a-9e568230ac2b/jiwotavikatutujenanuris.pdfIn PDF document text
    • http://beritoka.rf.gd/biblioteca_online_livros_em_gratis.pdfIn PDF document text
    • http://dazigeles.rf.gd/bexofujavawe.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/verufibalozateximavalas.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/evh_5150_iii_50w_el34.pdfIn PDF document text
    • http://dakafatuvuguviz.atwebpages.com/50839918503.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/eia_crude_oil_report_schedule.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_off0000fb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB58 4404 bytes
SHA-256: 347b1bff826768aed433c5f3d8bca8c1c93de94e60724c998b6c95c3936d8ef4
font_01_sfnt_off00010a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A96 5136 bytes
SHA-256: b8705b7edc9538863f990178c1af1269d9f9bcf3acbc22c3fbd547268100dea8
font_02_sfnt_off00011bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFD 11648 bytes
SHA-256: 1f1ef3d1ee636211457723bddbf4c03575d5c0dabf5b932507550bb199c3b9b9