Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbcc08ba9cf3a8fd…

MALICIOUS

PDF

79.8 KB Created: 2021-09-10 18:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ffe2ffd6f33b8ed69cc79fb9ecdb9af5 SHA-1: 5c7da374343fb2924513338e79e93567f5a547a4 SHA-256: dbcc08ba9cf3a8fd2e8f8eb4d49f5fa4109aeca893a9be9a31a94f72fd804257
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were extracted, the sheer volume of suspicious URLs points towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://infrive.ru/uplcv?utm_term=redmi+note+9+walpaper PDF link annotation
    • http://gzsjlt.cn/userfiles/file/wasawatazokaboxeguxakodat.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/pesevesop.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/88363042298.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/43794582330.pdfIn PDF document text
    • http://decaiyun.com/upload/file/2109011444373351537mva1rs773yl.pdfIn PDF document text
    • http://katela.net/userData/board/file/xagebexatirinezoligezafed.pdfIn PDF document text
    • http://axwelindia.com/uploads/91176130265.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135d848cc5bb---lowixozajupegagadavizagis.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/kubetado.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/39362984215.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/zakebawam.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/vepawobufodosemetikiles.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/bafotefavozorosojekum.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210903210325.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/79824926248.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/jifobojo.pdfIn PDF document text
    • http://partnercable.hu/files/17847524669.pdfIn PDF document text
    • https://fultoys.com/userfiles/givabekamajogamigozafivif.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/faluziz.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/kusug.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/newisewux.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_off0000cdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CF 10684 bytes
SHA-256: 33d0394ba73f84a92c6bb4da4528231b2b9399ace5a110e3c816ba6aa5aaf684
font_02_sfnt_off0000fe50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE50 19700 bytes
SHA-256: 253714db0c017364386cc0880f9e8835a00c1b7208bf74e6315b23a07f7e8065

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