Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb9a13bc1c4c87d…

MALICIOUS

PDF

71.3 KB Created: 2021-09-27 05:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7c9d5670da8e064311c9dd19454f09c0 SHA-1: b103156197dec4f90cdd6d368a95b7463b4036da SHA-256: bfb9a13bc1c4c87daec5dd82922fe3d9fa77fbdea94c0a567004cb2b7a385cfa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded links, many pointing to potentially disposable domains, suggesting a link farm designed to host phishing content or distribute malware. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://bagliodeimille.it/userfiles/files/70138565040.pdf In PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d252754d55---13226489754.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/28819236976.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/dufitufiman.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/24324826124.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/3505dd5261d02858fe60dd92f7e5665e/nejodisumojuzomopamo.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16143c4a377aef---8981189599.pdfIn PDF document text
    • http://roocenter.ru/upload/file/16273991143.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/2109152012252260564b0nuu.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/29896660501.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/budubimejajuzi.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/nujevotazinanuzipifa.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/38395875713.pdfIn PDF document text
    • http://aibrpjoaae2.specialty-match.com/upload/files/98575168131.pdfIn PDF document text
    • http://learningkey.org/userfiles/40199316979.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/kasixukitameb.pdfIn PDF document text
    • https://aedwea.com/upload/foto/vuseribumawugogabiduwi.pdfIn PDF document text
    • https://digireg.cn/upload/kikawumubudemot.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/dipajimavojel.pdfIn PDF document text
    • https://msiutilities.net/documents/sawotexotid.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/48889572138.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/jibisu.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/pukinuwitavini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=swift+streamz+apk+crackPDF 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_off0000b18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18D 17372 bytes
SHA-256: 21d9515a3c4ba2e93e3294d7ed8b65e32ff1bd73b8e724f5d5893654036fe29c
font_01_sfnt_off0000dde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE8 10684 bytes
SHA-256: fab48161e7c517d3e87af1e2c87b032b17cae020ce09bebfa785ede460b09591
font_02_sfnt_off0000f690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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