Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3790cda02c49a6…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 03:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4abb7f48473b4fb8e712c498990b27df SHA-1: da0920106664f278afaa24f68442984311de69e9 SHA-256: cc3790cda02c49a6fc30df6d6180b63405cd5596353ece452b10f9e02f76a4e9
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to suspicious PDF files, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to deliver malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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 http://hockeydh.com/files/ups/files/kazutaxuxozisepamobu.pdf In PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/17262406370.pdfIn PDF document text
    • https://trainova.com/userfiles/file/gusifesi.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/64626912635.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/neserakobip.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/mijedopowogomotul.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/xaxevezagejurakedaxo.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/50914188418.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/jomexizulekalojimu.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/60217751748.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/24896895050.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/0aa095e13cddc5974a1abbd5a095506e/madarawoxuwumafivejubuj.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/52808949216.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/70662956284.pdfIn PDF document text
    • http://cichanski.com/Upload/file/wobudisiwatob.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161365c52292d4---liselusawuj.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/35240870908.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/buxiwigufikar.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/12656735365.pdfIn PDF document text
    • http://scro.ru/pic/file/nufojawit.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/46031049805.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/tabulawoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=telegram+qr+code+scanningPDF 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_off0000d8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AF 18204 bytes
SHA-256: a28c5a77b2b511980596e30f4ea460c1db4f1e2b72124c28fa1c03c464a25464
font_01_sfnt_off000107bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD4 10724 bytes
SHA-256: 2e2254740a5d71e210ab4e313b3ecaacc20ca5a4c2d32d7ba355b8557e9f6580

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