Malicious PDF — malware analysis report

Static analysis result for SHA-256 54dcb3b0dca11ed4…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 18:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 606c35262288d136e571254567dbe57d SHA-1: 8667890f895071b52a660ab2b417da2ec4d66ef5 SHA-256: 54dcb3b0dca11ed46c15141c4798750c1758a972856db23f86e67e292d710b9c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many of which point to other PDF files, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern.

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://assofmt.org/ckfinder/userfiles/files/1476396069.pdf In PDF document text
    • http://1night2day.com/UserFiles/file/36931218001.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/lafawefila.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/jujesimexil.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/13466334594.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/28662668551.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/noxadeb.pdfIn PDF document text
    • http://seamacros.com/upload/file/lugativezamawokagulujidep.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/jugevivikodetu.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/11225523665.pdfIn PDF document text
    • http://tipiland.net/upload/file/10573730634.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/61932651817.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/rovuzuvenago.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/8ce4f395e05d6a2f6cca7ce112b45983.pdfIn PDF document text
    • https://dm288.rs/slicice/file/nemukutidojonovepajozi.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/xofixubezabuwibitezuvut.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/98462001064.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/xelel.pdfIn PDF document text
    • http://irths.com/upload_files/files/94938793407.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/33230538747.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bee8ca601---25591246785.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16141ab0bc1dea---wabaporexibadexujadabugu.pdfIn PDF document text
    • https://denimder.org/resimler/files/nubakozopavoto.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mujixil.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/8404411083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=shadow+fight+apk+hack+modPDF 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_off0000da98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA98 10772 bytes
SHA-256: f1e86d0ff218bfa71f0f6a6b31bc1fb438bc46278d9d1928a472b16f02122add
font_01_sfnt_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B60 16820 bytes
SHA-256: 15e0b609120d5ada5b2642079f49543422aff9122e5eeb624abecd44469184b7