Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d79727eb533d2f0…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 06:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 57e4aa22a09955bc9805ea3229988c54 SHA-1: a6a3273cc09de4f4228b458ee00b46a175316913 SHA-256: 2d79727eb533d2f0cbd3c67ccac35de27dd231236caf7d791cb04626784f09b8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of distinct external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.espaciocultivarte.com/ckfinder/userfiles/files/dezabesokaboligisu.pdf In PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/20287529593.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/nibosamapilufapudukevofav.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/94240268889.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/85901001777.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/38997112581.pdfIn PDF document text
    • http://ativn.com/upload/file/92211389938.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/30328833217.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/95585390963.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334ed78bde2---60760843815.pdfIn PDF document text
    • https://ratodua.com/contents/files/dufop.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/zikudejupiwutofogusewa.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/julabogujilo.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/48847394374.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/72167861663.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/50717059192.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/vosexaru.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/lizomitoxikefuvogoje.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb412eb4ab---90567073135.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/75425915737.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/8655230029.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/26730747580.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/viwafugaxujigexusezavijal.pdfIn PDF document text
    • http://unseretochter.com/images/file/torezekepox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=download+snaptube+old+versionPDF 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_off0000d691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD691 17436 bytes
SHA-256: 9a692793d14e7246df80b2d5e210d4faee7ca6b087afe42dbe2d2abece422d5b
font_01_sfnt_off00010480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10480 10780 bytes
SHA-256: 005eee20982e97f5e3cb23b0ccbab8c150ba7a9371cdb13d4940e7dce6c1fa5b
font_02_sfnt_off00011d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1