Malicious PDF — malware analysis report

Static analysis result for SHA-256 9301ad6cd0764002…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 21:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6726c125230276c5e8fc1377c4f3e9c3 SHA-1: 308a2dbaea67299c4804937c986123fb7cef9c25 SHA-256: 9301ad6cd0764002b4c4100c1881b93691918a4ea67127b7e43e9975d341abae
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also functions as a link farm, directing users to numerous external PDF files hosted on various domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • 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 http://tatagz.com/uploadfile/files/zidewudififep.pdf In PDF document text
    • https://bangvetthuong.com/luutru/files/53959702179.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/ropoxinujugavobov.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/mivesojijoseporuwijeru.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/22931324961.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/93752426745.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/xodomaronixijojabugagop.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/26926961443.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/70487335571.pdfIn PDF document text
    • http://topstec.com/d/files/nexobumogujukej.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/89747658263.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/goginegeranerimolew.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/93627035047.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbfb7bfea9---tesapasotupajubusugefaz.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/13707624800.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/92972022271.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/78002298106.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/vokavexotugexolip.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090402123052.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/levigusimajupi.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///fixadiladisoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=fear+and+loathing+in+las+vegas+ytsPDF link annotation
    • 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_off0000d3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FB 17892 bytes
SHA-256: b2826848c1b03290a7587a1befdff329d440dfa72141d27e02735e974fb15d2d
font_01_sfnt_off00010341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10341 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B58 10684 bytes
SHA-256: 1a6d2f371ecb90b780b1109c90cdd30d49d7d91eca1e94ffd4c7249febb69784

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