Malicious PDF — malware analysis report

Static analysis result for SHA-256 975cbe4f2736e2e9…

MALICIOUS

PDF

79.2 KB Created: 2021-09-11 18:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 04b8202a6ee824b152c2fe9c0e0fff79 SHA-1: d5ced11b16371710176db0c738a62460b5ffe276 SHA-256: 975cbe4f2736e2e9cf0ca2855d941a9780609d8e2dac8c93811f1c21e258214f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://infrive.ru/uplcv?utm_term=cravings+by+chrissy+teigen+pdf PDF link annotation
    • http://madmojo.com/fckupload/file/49605803772.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/72220820443.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161307adbdb9a5---puxegefosowejerogebutide.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/bijixetaliroginoduxuguluz.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/lusakufiweripofaxot.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16135c9f180e08---87762223381.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/luxofapavuge.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/nurepuzatamimifafuxuwise.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/tezubotep.pdfIn PDF document text
    • http://napiarsaigh.com/images/wopujiwokadevuduku.pdfIn PDF document text
    • http://gdgom.com/upload/file/210904073309905895nwgbmdp21sb6.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/92685025098.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/suwozipopepojovok.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/zemebisaworujimo.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109051825065458.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/vudowifavu.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/98452903266.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/93106394777.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/kelojega.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/rulawuridixamibukagaw.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/lifunavesi.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/2405400955.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/84131908586.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_off0000cc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE486 11084 bytes
SHA-256: 9e625fecb8cf42e42777ebf412941ff3d7ea2657af07e8318c48ab526e73ed8c
font_02_sfnt_off0000fdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF8 19064 bytes
SHA-256: 396675985676f26f81610d3cdd4f5bbd8b8fcf9bd0dc9ca4bc506b8be7946843