Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ce38e8e0557d24…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 04:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c4e618a1175c89de9e91f47656ebcca8 SHA-1: 1eb79767855cbc551c2be4097fec2dd78db7dfb8 SHA-256: c4ce38e8e0557d245745b500f61e7635e150bddedb4be53aa997ca81f0d2d644
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=best+no+pay+to+win+android+games PDF link annotation
    • http://delannahotel.com/user_img/file/37481183594.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/legun.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/bipexiwujajoziribagobosak.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/18081364606.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/poguvepamen.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/33016289919.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/pumuponemonemonotasakuxot.pdfIn PDF document text
    • http://huntland.hu/upload/file/vivodetufuvo.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/49617321943.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/20330923625.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/zamibakufezetujisojidej.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/2667029253.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/82129916149.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/76439121708.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/39059839307.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/lefujumuwiruf.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/83156063262.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/tuzigafixolonelarawobesap.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/99268769983.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/voleput.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/74408592571.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/fomorided.pdfIn PDF document text
    • https://adikmanis.com/contents/files/68916357600.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/30169325166.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_off0000b0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F8 10940 bytes
SHA-256: b7ea59cb5109a4522aad59024a6d9f9eb06361771178c5d41943976c9463ed80
font_02_sfnt_off0000e23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23C 16456 bytes
SHA-256: 9bb31538f1a69f010b96321ad9c68c5a42e4dab530a16d08184440cf621740cd

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