Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d1efcdb9d6af73…

MALICIOUS

PDF

78.6 KB Created: 2021-09-15 13:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0051c3d6437d87209b83d1f4edf6151c SHA-1: 3cc7cd6e4f25bd15ead8c4a19344ba27112a2ee5 SHA-256: 24d1efcdb9d6af7395a7e88ea6e8e1c45b20f49304289ab26439a3c9d21f7dfb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. The presence of numerous external URIs, many of which appear to be part of a link farm, further supports a phishing or malware distribution intent. The ML classifier and ClamAV detection strongly indicate malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ketchas.ru/uplcv?utm_term=notification+like+iphone+on+android PDF link annotation
    • http://studiolorenzino.eu/userfiles/files/katuwatobidekozutugivajum.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/bofebusezod.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/dazidikaxalomidado.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/25770328883.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/ketune.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/semurixipefuta.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/11277720509.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff9094cc43---93183453664.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/42806870135.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/taxajan.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/37917676067.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/65039204230.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/nepavafopapapatojunuti.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/59302977119.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/bupabopeloxadobe.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/2085380326613f3a5614ba5.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/zurokodugizowidamanifeko.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/7460289008.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/zagaki.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613879f6182c4---nuwukosigi.pdfIn PDF document text
    • http://air-con.ru/upload/files/tabadamozex.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/sojanepomunegufilag.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_off0000ce4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4C 17760 bytes
SHA-256: eda018b229cdc7fa78ce42172f980c8e66141757af2344f22283d66675376c71
font_01_sfnt_off0000fcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC8 10616 bytes
SHA-256: df9a2d6359b08180d4f0d442adefbe3b1104958bbb832ab5ef8d082851cbe7aa
font_02_sfnt_off000114ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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