Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb110c8dacaf7500…

MALICIOUS

PDF

79.1 KB Created: 2021-09-12 15:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2d4cb346df976a61f3d28de86288e40b SHA-1: 11d4c98938f728b65f51077ab00ee409d674101e SHA-256: eb110c8dacaf75008bbc2016baf927bd03e9773e1202aa373db9b4eb8a0ca7c0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are used in a link farm pattern. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload or phish for credentials. The embedded JavaScript is the primary mechanism for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://infrive.ru/uplcv?utm_term=online+movie+downloder PDF link annotation
    • https://blogsma.com/files/61413193777.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5407594f9---xilix.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/27877061629.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/ziritepejufenanosavet.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-6/20210906034832518531.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/varixopusuzolib.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/49743126527.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/66871158973.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/bibumatanuda.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/44342704162.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/62430791196.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/47171653308.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/69128628281.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/bomanabof.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/volepojubawugen.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/teduwas.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/jebepanonepan.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/61805426590.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/wugujegepebol.pdfIn PDF document text
    • http://sswjeans.com/files/43824363002.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161328bce0796c---japalizolipiko.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/92265273835.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210911000952.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_off0000d4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B6 10156 bytes
SHA-256: fd9b092d7512a0bce33c1ef17a907f7c72f1f330b072ce70313b8f77b69dde0c
font_01_sfnt_off0000eb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5C 17188 bytes
SHA-256: a0258530eb0342012f1b7c5b3b813600e586d79297760f361c4c7cf142d586e8
font_02_sfnt_off00011748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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