Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d090fb23c953f77…

MALICIOUS

PDF

83.7 KB Created: 2021-09-16 01:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa1689a516bf4f9223ee60c478250e40 SHA-1: 17e0de5cb539d8766ff5c2ba1d9c1989e5aeefeb SHA-256: 1d090fb23c953f77c54b044e4d03202869b7441e27539f0ea04c0a96989bc2b3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://yizhu580.com/ckfinder/userfiles/files/lufejaxuli.pdf In PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/063896d42e0bb671e4f70431108235f5/xubetimikub.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/17852838769.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/fapudolimazebogaz.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/84320314013.pdfIn PDF document text
    • https://tkbhanna.com/ckfinder/userfiles/files/65997432113.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/7022239540.pdfIn PDF document text
    • https://simorgh.it/uploads/file/14409563538.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/riguvewopixi.pdfIn PDF document text
    • https://nls.vn/upload/files/63932576352.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/80069811254.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/fibej.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/jubapumaliri.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/pupafigudime.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/bejixidikopa.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/pasotefafaw.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/piwejagaxabafa.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/83985473027.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364292c615a---bujet.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613e61ea64f86---misutixu.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/madino.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/556315692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=best+gba+emulator+on+androidPDF 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_off0000e4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B3 16888 bytes
SHA-256: 45f6de352827b1c90bb319117e5ef1397f4e88c782fa61e6962e8f0d67cbcf66
font_01_sfnt_off00011060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12877 10884 bytes
SHA-256: 7bfe36c7d7b30d7c38ff38f99d1255e007b71994e514133d2c0b38b350cc5229

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