Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a704d2ef4f3448…

MALICIOUS

PDF

87.6 KB Created: 2021-09-13 20:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: da69fcaf9259cdaf3f5d6c87c25638cd SHA-1: 87870088aca33bdd346a244e358661e067688ff3 SHA-256: e3a704d2ef4f34486896dd179812bc9e2aa081fe6e25d58615858425ccb4641c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicating a link farm or redirection mechanism. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent, likely for phishing or distributing further malware. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pistant.ru/uplcv?utm_term=venom+online+watch+movie PDF link annotation
    • https://balbok.net/admin/ckfinder/userfiles/files/3699966526.pdfIn PDF document text
    • https://pcetravel.com/files/file/56088113034.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/xitozinobumixitefifesagiw.pdfIn PDF document text
    • http://abwva.com/uploads/files/15965256640.pdfIn PDF document text
    • http://wenfengsi.com/wfs/WebFiles/file///2021091322334741.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/modojibeleb.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/winuwifavorur.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/10141647720.pdfIn PDF document text
    • https://domilot.com/uploader/files/84538326078.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/nugap.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/93568085428.pdfIn PDF document text
    • https://maviet.vn/upload/files/66017355577.pdfIn PDF document text
    • https://autoskola-scp.com/files/40749371687.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/53806877872.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363f465f22d---petexefakarafepu.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/wogaboxubovunarenigazodo.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/zogofokadubu.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/94678874823.pdfIn PDF document text
    • https://kueapem.com/contents/files/25164010985.pdfIn PDF document text
    • https://kimcert.org/E/file/66171257096.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/64624470180.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/2517539857.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/97614275551.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF226 18368 bytes
SHA-256: 8b5c6ba97b8c519f6601d3b1c850e6c34518f45162fbefd95685ae6c5cf66266
font_01_sfnt_off00012182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12182 10348 bytes
SHA-256: ccae1eb12e376f3b0941e98c412d7c74bfe6ac49cca16181835d35cd34f231bd
font_02_sfnt_off000138bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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