Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6fed49488981ff6…

MALICIOUS

PDF

84.0 KB Created: 2021-09-12 23:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 841c9df03bb7500069d4eb67d7f31524 SHA-1: 69e3edfe3e1eb12afc529006e1ba1b41e3bd6883 SHA-256: b6fed49488981ff6ce6c2ce4661be66c7de7ea1e6a2dd3fdbf089e452c879984
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files, likely to obscure the true malicious destination. The 'SE_SECRET_RECOVERY_LURE' heuristic suggests the document's content is designed to trick users into revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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 http://studiomarcheluzzo.it/userfiles/files/bonibef.pdf In PDF document text
    • http://jinsonmetal.com/Upload/file/fupaxuxikimeporidofoba.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45572640626.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/50685777404.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/donojubavi.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/44367159726.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/14785829995.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/14910123885.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/wopepa.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddee3455d8---57254498445.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84832280791.pdfIn PDF document text
    • https://medtek.vn/storage/file/xudedamidapivuj.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/ledomoletefadumum.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/zadunalabojagatudejo.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/72377762590.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/nokotigoruxupedareku.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/ruzezowikowefa.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/lowunet.pdfIn PDF document text
    • http://elitacasa.it/images/file/42506901386.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/navogoxaduwuweno.pdfIn PDF document text
    • https://lasanisports.com/files/kuwedoxob.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/tejawomudesiputusop.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/45615833881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=cara+scan+barcode+di+hp+iphonePDF 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_off0000e4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DA 10636 bytes
SHA-256: b1b0a510aa18e94fe7514e07db66165666300a96e5f7cccb9cc545565e61965c
font_01_sfnt_off0000fce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F9 17420 bytes
SHA-256: cba5b7a1148cdecce99a9cf5ff036c38deb8d49c7d0623988becd9f64241585b