Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e88439b74a55d7f…

MALICIOUS

PDF

79.3 KB Created: 2021-06-02 09:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 99e96986c6695104adf24506bca02a31 SHA-1: a3fa9a8db254dc85bd893a1732f7cedeee9b2c2a SHA-256: 3e88439b74a55d7f8e3c8f9da2115d8b31830d1fd56e09c7be9574c66154d5ca
126 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to direct users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself is used to host and present malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://laborke.ru/pbw?utm_term=high+school+musical+2+cda+ca%25C5%2582y+film+po+polsku PDF link annotation
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/mubaxudelejurog_mevesekegero_wamenusuvew_buzedurokepi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464522/normal_5ff901c399f8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412773/normal_6006ff2a7350e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376875/normal_6028c22b22a1f.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4460723/normal_60b4b9045d4de.pdfIn PDF document text
    • https://favasebuwakule.weebly.com/uploads/1/3/4/3/134328846/1f5fbacf33ed018.pdfIn PDF document text
    • https://niduzipotobumam.weebly.com/uploads/1/3/6/0/136054567/nimusoxive-juxagesokap.pdfIn PDF document text
    • https://vuzaruluweketex.weebly.com/uploads/1/3/4/4/134478477/tipajap_godoginatitufi_jogotarevimupu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393514/normal_5fef828db3a2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467278/normal_605b055de5892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473379/normal_60592f95467e7.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://jeselivid.pbworks.com/f/laxmi_prasad_devkota_books_in_nepali_language.pdfIn PDF document text
    • http://namikikis.pbworks.com/w/file/fetch/144493401/xigekazanenovupekuvutew.pdfIn PDF document text
    • http://vifogajo.pbworks.com/f/meronamuxokusubuwimixaw.pdfIn PDF document text
    • http://pezeliv.pbworks.com/w/file/fetch/144426198/24238008957.pdfIn PDF document text
    • http://ronefete.pbworks.com/f/solotureruselagoteremapas.pdfIn PDF document text
    • http://faxamom.pbworks.com/f/pipiwizokukakiler.pdfIn PDF document text
    • http://mumubib.pbworks.com/f/what_does_42_mean_in_hebrew_gematria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77880d48-e57d-4ed6-9f70-133d588c95be/kufiz.pdfIn PDF document text
    • http://bukafag.pbworks.com/w/file/fetch/144496914/87763984813.pdfIn PDF document text
    • http://nanefumipopo.pbworks.com/w/file/fetch/144490164/litopeziw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a0c6dc9-29f0-4ca3-b5a2-4ff346883cee/5838186790.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/venn_diagram_questions_and_answers_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea0365e4-000a-479a-bfa2-8bfbdf398479/fizuxuvuwadilejobiw.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_off0000e3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F0 5368 bytes
SHA-256: 7bb1d1351339df0a0f188c27a109703adf1ba96546181427a0acf9a90907d39f
font_01_sfnt_off0000f648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF648 13656 bytes
SHA-256: 38880c69d71eec84b9d61f4e1a58771453271439a1cd6135821b3aa11ab54bfb
font_02_sfnt_off00011e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c