Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db7444ec96f3efa…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 16:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0ff57b45634d921ae9fa1c6011f79d66 SHA-1: 04cd305440d4617d8909153a2360184654dcb3e6 SHA-256: 2db7444ec96f3efacb50848fb18af86214d4ca0340e994f61d223195a78e79e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing a second-stage payload. The presence of embedded URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://pixomot.ru/uplcv?utm_term=the+chosen+download+app PDF link annotation
    • http://grabnerestriche.at/wefututejipaguzajadoven.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/biwinivesi.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecafa51756---80785168355.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/gorabezoludofemunowe.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/40039144647.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109071627062568.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/89832822152.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/senubabitogolabixafifor.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/watodusuvibosoxikufowip.pdfIn PDF document text
    • http://pekbdt.com/filespath/files/20210904041338.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210902012342.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/41831124665.pdfIn PDF document text
    • http://www.bash.cl/media/file/95389409168.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/81306785950.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9d53de0ce---fuxeni.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/48246321163.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/nugedaxidujofe.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/94393830804.pdfIn PDF document text
    • http://standdominica.org/files/files/zifobinanizavimaj.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210911000508_3c66oo.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/xabafevefuzekefisirorow.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_off0000d889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD889 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09B 18096 bytes
SHA-256: e321adbc7ee0c90c2b9b5079c64db189e64b6f4119ad7de2dbf2c3812012610f
font_02_sfnt_off00011f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F80 10372 bytes
SHA-256: aad3af0fc32431638f20b5d9b4e074ad7a4e99fbe7a47d128b30731824f7f280

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