Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed038312125b281…

MALICIOUS

PDF

90.5 KB Created: 2021-09-20 11:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c2a626ae0e7b4cb310835b1adb62e78 SHA-1: fd3e029e44a03d2b62ee59df3d9d139502e3baf1 SHA-256: 3ed038312125b28118bbdedf9f1b3834e36625252b7fad85afec677071261bf3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing and malware distribution. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly indicate malicious intent. While no scripts were directly extracted, the overall structure and URL distribution suggest a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=stream+venom+2018 PDF link annotation
    • http://lynhuagiasi.com/Images_upload/files/11057584808.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/ximezekegamofusukenom.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/ragafejasakezugigotisuf.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/999015674.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/wimeripe.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/mupagirigefobaba.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/19826819525.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/batozopalurikiduvofo.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/wujavopaxijopexesufera.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/fuvinixebo.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/jofimawimesefufa.pdfIn PDF document text
    • http://zaiger.ru/img/file/79172137608.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/xovaw.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/9334250421.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16140ef1a876c7---61598025320.pdfIn PDF document text
    • https://mollis.rs/files/55342579504.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-12/images/files/85303875138.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/1671761419.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/vodavumagegukijawab.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/33802601354.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/kisik.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/vojaxuvukizobita.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/14414572089.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_off0000f805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11017 20232 bytes
SHA-256: c378ed007c69b60d4104477ad0d8f53f4792cdbff2882e11d07570a2f6f02658
font_02_sfnt_off0001448d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448D 10604 bytes
SHA-256: df65222ab4bee7ade3a74ca2143ab45b525264eee960c8d1579e1fe454883749

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