Malicious PDF — malware analysis report

Static analysis result for SHA-256 c655f2dc07c4b9ef…

MALICIOUS

PDF

84.4 KB Created: 2021-09-09 00:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3c2036a24cad222dbf97d912d3186941 SHA-1: ef5a8972f1bde182260c12790cbac3173b064298 SHA-256: c655f2dc07c4b9ef5111c87664cc98eeda16817527caf19bb66e1f7f1cec0d9a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains embedded JavaScript and a large number of external URIs, many hosted on disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript (T1059.007) indicates potential for malicious code execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=hack+hill+climb+racing+2+download PDF link annotation
    • http://dalnoboy.org/data/filestorage/upload/files/mikefopod.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/siguvasatilufofa.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210909_E709E5D45B25AD79.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161320ae82cc68---69265366534.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/3335592768.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/23528315661.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/99230035581.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/vawenujiwogutulupedevege.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/72840005817.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/77269338164.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/vakidusabadabaw.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613688466963e---damapogezakonukez.pdfIn PDF document text
    • https://lorus.rs/files/reramikitogitiwamojoguti.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210901095558.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/tumanuj.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/gawubuposubigovududo.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090402311273499.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/1807183440.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/titimunuxiremukor.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090905095456.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/1562490855.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/82662511501.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210908040820.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/50931516283.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/76329718498.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/97966477174.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_off0000e19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19E 10848 bytes
SHA-256: fc383639d993ad1f1da29cf2fa63bedf1c1f206b617a7f6bd4ec766031c99ad6
font_01_sfnt_off0000fa46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11258 19288 bytes
SHA-256: f2a9b1648726475df0867eaef824aad42b5882686d6ddd63c4a5c8e10a365328