Malicious PDF — malware analysis report

Static analysis result for SHA-256 de82f0050d263a18…

MALICIOUS

PDF

74.6 KB Created: 2021-09-08 21:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d0b35cb4b59e4749f90089005903dea8 SHA-1: dd9ac3976adfe4357dd2f3c02db2bae22d9bfb32 SHA-256: de82f0050d263a18bddca82c881a5e868c76b60d35c0b7ce80e9cdcc5cbe0684
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as malicious by ML classifiers and ClamAV. It also functions as a link farm, hosting numerous external URLs, many of which point to PDF files on disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are commonly used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://krisoc.ru/uplcv?utm_term=indices+negative+powers+worksheet PDF link annotation
    • http://www.somdattabasu.com/fckimages/file/16845226205.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5066940165.pdfIn PDF document text
    • http://tano-cable.com/d/files/fimusasisigelepasuj.pdfIn PDF document text
    • https://e-midas.ro/files/file/majeregewakovenezeg.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136315aa31e9---63542598431.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/tuvajoxari.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210905_8897EB473A819122.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/vinagovivabizorit.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/beredugivo.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/75534106283.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/22818192806.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/raduvuxiwovukaxowozo.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/bureminosupejewo.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17855734568.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/95564845774.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/zetukidebugorikago.pdfIn PDF document text
    • http://svx.su/ffile/file/15139070298.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/71485603714.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/jasomanufij.pdfIn PDF document text
    • http://samtekelektrik.com/files/32355879255.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130f2074c28c---rigarox.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/javavupuk.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_off0000bb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD312 17996 bytes
SHA-256: 17f217fedf6a7d332c0e695f2dc957485be7d0d18a7c45faf7cd71115d1c8c54
font_02_sfnt_off00010235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10235 10940 bytes
SHA-256: 2030ff87e9534e70e58cbaa7e8e22b9b65cffc1d1f637c13245f0df9d64656ec

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