Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd6d53306fbf0e8c…

MALICIOUS

PDF

92.9 KB Created: 2021-09-16 20:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5934486c1238b398a265a28eeab4bb08 SHA-1: 0f255f00682fc2dfc1bda5cd77ee44c3d60d01fb SHA-256: fd6d53306fbf0e8c6264b8b74f32ac93ab75435ffbdd62f286dcbcac4c04c4d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and the presence of external URIs point towards an attempt to direct the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://guanzhuli.com/userfiles/file/32400734620.pdf In PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161416169babac---68300698556.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/28630093500.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/91655545198.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/84268295054.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/4705280771.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/jotogizagimamojijotivi.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/84t5p712c0apptqcij533nlktu/vedipedefefoni.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/maworibelu.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/kiwam.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/44324306311.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/nivubitogekul.pdfIn PDF document text
    • https://grandegroup.net/files/vixagogelipulefajowaminuz.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/fimarafiwajavumam.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/63141523193.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/24632066435.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/71484725731.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/tavevudivox.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/karuwogurivaseramomamo.pdfIn PDF document text
    • http://nineslash.com/user_file/file/43619168468.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/98316319349.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/36687137532.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/35318764708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=principles+life+and+work+by+ray+dalio+pdfPDF 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_off000102a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB8 18708 bytes
SHA-256: 1bf5c0ff635647749f62355d75f6e8ae64f1639de56284e91fd60b5df6aa924a
font_02_sfnt_off00014b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B42 10948 bytes
SHA-256: 569518bb94d1ab5275b7c46408cc3bc3c575ded4c5f00663b8c74e573067fb4a

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