Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2bdb8e5b4b41178…

MALICIOUS

PDF

72.5 KB Created: 2021-09-21 02:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ebe81b339b5f57eb0ed9c318637fcca8 SHA-1: 333547d4a4a5a355022172c405d7ea2fffc6d5cc SHA-256: c2bdb8e5b4b411789d5e446a69bbea56dbcc0571af4cb5e4478f380be297aaf7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to potentially malicious domains, and is identified as a link farm designed to distribute traffic. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination through a large number of distinct hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://argekaucuk.com/nbg/upload/files/97680422901.pdf In PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/xevonukesijadepanezuxe.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/21761613555.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/lizomoreritase.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/dejumuxorew.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/zogafimunamafu.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/timugisuvutunovuban.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/logabekuxamabelel.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/pifukezofewumerudidim.pdfIn PDF document text
    • https://rajaunited.com/contents/files/lakeju.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/xoperinem.pdfIn PDF document text
    • https://blogsma.com/files/77086617838.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/tufukomexasizesizazive.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/21232606219.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/kovumebuvobobozafijukaw.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/37470736960.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322fa9bfd1c---72264737444.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/nisarureni.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/nikobupajodod.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/59879959391.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/56741105375.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/fipakekuxenij.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/suguvuposedujewaf.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/gavoxeditavigiwotepunonot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=one+night+in+miami+onlinePDF link annotation
    • 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_off0000ba7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD290 16928 bytes
SHA-256: 67ad4961663ca44e9116676f946b62677df04fb2986d2ab512669692849428c0
font_02_sfnt_off0000fdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC1 10312 bytes
SHA-256: ac78bf97dff8caff5a9f215a1498fa6ea30cd1affca5486a5e56e752997d0368

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