Malicious PDF — malware analysis report

Static analysis result for SHA-256 d709392929941e53…

MALICIOUS

PDF

77.1 KB Created: 2021-09-25 04:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6d6c846704c5282a7661ddabbb76d3f7 SHA-1: 40c1f4823f30c5eb7a808d9832d1b63021600f0b SHA-256: d709392929941e53551d7235fd6f36e0b7cf985bb60a3fbfbf22f23509c17f21
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://adacu.org/userfiles/file/20210904084537.pdf In PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/lavusetifafoperopujuludi.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/sukeduxumafovudafeziji.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/74134970373.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/83981011567.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/62505712324.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/19611630683.pdfIn PDF document text
    • http://status.cz/UserFiles/File/49846119093.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/84857430290.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/23b3bb472b57feebae6d47b37df1e1da/repipemijudazozu.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/22918913572.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/damuxexepopuvowukop.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/48400981563.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/kaxozomemesavuponuwizud.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/wozuxizixuvokodisugu.pdfIn PDF document text
    • https://ysh.my/userfiles/file/xeravu.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/xusenim.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/39815364051.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/e56c726a0e6055ce2f6b8d97f34ee6a3/75504697035.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/lejikix.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/56344781051.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/92206521347.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/70734316355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=can+i+see+who+viewed+my+instagram+postsPDF 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_off0000c33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4D 19100 bytes
SHA-256: 46a867c6ac56c826bf0f1e38e405e4fe7df95cc01f4bcbd10448003395826dbb
font_02_sfnt_off00010cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF0 11088 bytes
SHA-256: 43cae3c4d71328cf3f9a2ac37b45c9981ae2d78be752bd5a4be7e0d3ed57d7f5

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