Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c6ecdfa91fe3f6…

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 22:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d0f45d506066bf47e86eb592795fb7c8 SHA-1: 0572d8b5b1f723a1705d30f06b6d68809c47004a SHA-256: d4c6ecdfa91fe3f615bd789cbf73b1039542d8f638b482f9cf56cc4c38081605
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is structured as a link farm, indicating an intent to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a tactic of using disposable hosting for these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=little+mermaid+nes PDF link annotation
    • http://trips-in.com/ckupload/files/wuretezinazopus.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/jajaruwokusefo.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138be4139288---3250731812.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/medidojirubafe.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210908_110603_125.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/mefipesarozekivuluzasi.pdfIn PDF document text
    • http://keacg.com/upload/files/25071492451.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/89019667434.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/22253926118.pdfIn PDF document text
    • http://rs-entp.com/upload/file/woripinifibadijowoso.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/95544258382.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/takanexebokideronipu.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/logamanilovuwinutaro.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/9823294514.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/92145334981.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/95539789195.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/pexoguxofiwavu.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/fetulaxaxuluros.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/17102683408.pdfIn PDF document text
    • http://xhzhengli.com/upload/79343264108.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/latagu.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da21e47b45---33126912496.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/29645738254.pdfIn PDF document text
    • https://agermag.ro/mm/file/33955616554.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/jufimuwemelenujeba.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_off0000dc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43B 19580 bytes
SHA-256: cab1b0aa3c728eea1ac450b9047f05824f0cfa3cf3f803430d211fbce97a3126
font_02_sfnt_off0001274f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274F 10244 bytes
SHA-256: 5b01fa38b6ebf9beb3826b1930af8abb4657c133dd3e9e184430f581f9cf3c65

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