Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f52e9bf6c5ded54…

MALICIOUS

PDF

75.9 KB Created: 2021-03-25 19:54:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 2a5219e4ef69fdf945e4ad34107a6c58 SHA-1: dbbf13d3fc6fddbb2784aee803dff501a059242b SHA-256: 1f52e9bf6c5ded5473cd446e5bd88a955ca907e9d70c6c59c3a9979c296f2f36
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users. The primary malicious URL identified is https://kuzutuzo.ru/aws?utm_term=how+do+i+reset+my+dyson+v11, which is likely part of a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=how+do+i+reset+my+dyson+v11 PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9948297a-037f-43fb-89ae-ebbab0f0ac1d/11439829141.pdfIn PDF document text
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_5e9fecbdf8244f4e9f7ad8e6a19344ac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d772b7e0-2c0d-4724-945f-793c638758fd/craftsman_lt1000_riding_mower_parts_diagram.pdfIn PDF document text
    • https://12dd324c-696b-4d67-8c19-991f3eacec2c.filesusr.com/ugd/eeb7bd_3679737c832e49abbb010dbdf5245873.pdf?index=trueIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_58f2847fa3d0480f9527494c08057695.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c6f3d3f-e348-4f32-b25e-7055b9cac7e9/zelijemadobetelajubonoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87c738f9-a116-4131-9c7f-1f0dc3270840/19547210584.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d85e8853-bae6-4e5b-9c04-c919e5520c36/pekosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcab6a99-1162-4714-b204-2fb152247d61/simbologia_de_diagrama_de_flujo_y_su_significado.pdfIn PDF document text
    • https://b81f28a7-a6cc-4df9-aebb-a76b708ee4b5.filesusr.com/ugd/df05b2_ee8bfcbf822e4baab70737c46f67853b.pdf?index=trueIn PDF document text
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_aa83e4e2e7d648b4952d0ed16321e344.pdf?index=trueIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_5417c8d6e6f4460d882edcc9333b1224.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/005a8ac4-b01e-4a4f-abf6-cc11db51de9f/5_dysfunctions_of_a_team_chapter_summary.pdfIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_a4c1d28143794bcfab7b5d89bf599134.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e189517-c04a-48be-99a3-86f8049ca0ad/an_ember_in_the_ashes_book_3_summary.pdfIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_400c403290ad4702b910e9830505ebdc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb4eac3b-3e3e-46f7-b7ee-dbadfa75824c/giledawujedujefakibeb.pdfIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_e979ae48366f47fa9d565471ca16e9f0.pdf?index=trueIn PDF document text
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_d8ffa50186554f02838290e55e8766b1.pdf?index=trueIn 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_off0000ecda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDA 4996 bytes
SHA-256: 59f25e11afa74f6c390ec563947b86fafe409fbe2392d864f18624a465fab09c
font_01_sfnt_off0000fde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE0 10612 bytes
SHA-256: f5ead7c5f802bff34fd0b945ac2deab4dd3fa0fe92552a637b6a45a775de77ca