Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8d9cc5a82adc78…

MALICIOUS

PDF

81.6 KB Created: 2021-09-14 23:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9cb62d66ed416407a9da2479d1de4577 SHA-1: fdd8f9b740b3d6abc6a17029be2a1227a841a5c1 SHA-256: ba8d9cc5a82adc78ef7b1f7e5d9e509b13523a25dcbdc611e588a83a102e8740
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=live+wallpaper+home+screen PDF link annotation
    • http://petukmahaaaraj.com/userfiles/file/75628152155.pdfIn PDF document text
    • http://sin-hua.org/userfiles/57874879416.pdfIn PDF document text
    • http://accronline.com/userfiles/file/gijaji.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/89578987221.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/26286379589.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/e6dc799579497996869c0fc9adee468a/butojukojikuwoweja.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1630590120a0437c15ef51a5cc7f2d.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/45712348456.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/fixufibogojurapeteke.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/50150501483.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/dugodurazagujokon.pdfIn PDF document text
    • https://maturana.cl/upload/file/55815684697.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/5332275412.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/49050454876.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/91949104445.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/2550637330.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/pejekatifezoxinosa.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/68587186444.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/21413165094.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fecbdaabaf---55033070757.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/nafaxuvifiluzoga.pdfIn PDF document text
    • http://gerocuki.hu/user/file/72287531445.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/25283446302.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_off0000d950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD950 18520 bytes
SHA-256: 9d4de37135b01ea75e18bcfaaadb0e5aaee6b6d8fbdd9dbff32d326cb9e3100a
font_01_sfnt_off000108f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12110 10648 bytes
SHA-256: 97c41cf847d572f8ebdaef8376645fc1c82f69b3e67c1826ea7060ff7e385126

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