Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08c15f591130d78…

MALICIOUS

PDF

77.5 KB Created: 2021-09-15 15:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d0a97c428a5e607dc89de46c6c02d0b SHA-1: fc8e7c043b3f10488103c36b2fca06b78c1b07ac SHA-256: b08c15f591130d7877df81abc2b2e70ce324d76227fde682958515cfde7efcb2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

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://archism.ru/uplcv?utm_term=prepositions+that+start+with+p PDF link annotation
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/kaluxovivapubudarisopem.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/94891016070.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631541623.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413d1db5d3c---nubepanuxurap.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/fimapesakaze.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/15765270637.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/durugagetolu.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/36634994220.pdfIn PDF document text
    • https://halkum.rs/files/10184926543.pdfIn PDF document text
    • http://stattus.com/assets/file/67622487076.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/54995458709.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/47736947032.pdfIn PDF document text
    • http://spakimthi.com/upload/files/47497094715.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/satibagimilezaf.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/sulipamozonafixosaxufagu.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/23467937180.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/sukot.pdfIn PDF document text
    • http://myredm.ru/uploads/file/felozaga.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/57847762988.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/39269651500.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/letogodon.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/66933286307.pdfIn PDF document text
    • http://arucax.am/user_images/file/nusowizazobodaravazip.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_off0000cb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB75 10392 bytes
SHA-256: 6ac4db3eca610f7c67595e43668fe342939cc8774541e5837edfa72bb7ee65f9
font_01_sfnt_off0000e2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F8 17448 bytes
SHA-256: c22661fc698942a16df8bcfbcfc43b3b82f36ced1d0cee8e88c2932b099c9469
font_02_sfnt_off00010ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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