Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c6a9afe6f2757e…

MALICIOUS

PDF

73.0 KB Created: 2021-09-30 11:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b725601544300f09017688080ba8e385 SHA-1: fada85dc164fb91b6d46ea5e78f479822866c215 SHA-256: f9c6a9afe6f2757e16b4845bb043072a698497212fb34ff741b66c8a57916ad0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://wastran.ru/uplcv?utm_term=broken+android+data+recovery+free+download PDF link annotation
    • http://yuanyoujie.vip/userfiles/file/viwowadakidiwurobuwagozom.pdfIn PDF document text
    • http://csp.hu/editor_up/jutotagoz.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/12344848986.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/33487887555.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/24009541145.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/43708684912.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/46667328566.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/67440956976.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/51044915968.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/tilozegivefironopanexesu.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/93609336244.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/giluguxonatiru.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aeb8b1220c---xiboselim.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/54bb5b7639c6a9bceb48b79a9eb2e95a/22180983810.pdfIn PDF document text
    • http://dichthuatanhduy.com/uploads/userfiles/file/58933598147.pdfIn PDF document text
    • http://maaramachandifpo.com/admin/userfiles/file/firezowixadigisod.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/bojomejamojafusi.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/faloxabuneluwatesowup.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/18640810927.pdfIn PDF document text
    • http://generoussecurity.com/uploads/xamutos.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/19932696082.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/73018223675.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/gitiganepinub.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_off0000b5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC0 18468 bytes
SHA-256: 0846f28f7689195bf65f4f1a5c09386ef30ab22671a33837af8d5807a3530757
font_02_sfnt_off0000fd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD53 10712 bytes
SHA-256: ce9023d3c9b556239f29f245ae4800affed56e27c05087018a41048774b144f6

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