Malicious PDF — malware analysis report

Static analysis result for SHA-256 25053ff23f9eead0…

MALICIOUS

PDF

90.4 KB Created: 2021-09-17 09:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3dfac34458fc2a55761cee128948c34 SHA-1: eea962d4e3d38c05298bae54a9fa44a286ce2a3b SHA-256: 25053ff23f9eead0050738728060a0704e390614f5dae0f080a676090ef389b7
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to solicit sensitive recovery information, such as private keys or backup codes. The embedded JavaScript likely facilitates this phishing attempt, potentially by redirecting the user to a malicious site or displaying a fake input form.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://kartinatv.org/uploads/files/66269949210.pdf
    • https://deepex.hu/hirek/files/mireko.pdf
    • http://zanethompson.com/userfiles/file/17989184771.pdf
    • http://hoangminhceramics.com/app/webroot/uploads/files/27530209218.pdf
    • http://drairtools.com/ckfinder/userfiles/files/57790787525.pdf
    • http://shengyaweb.com/uploadfile/file/2021091407490779.pdf
    • http://nhuaduongnhapkhauaz.org/upload/files/gerabofezoja.pdf
    • http://wirheiraten.de/images/file/90566450071.pdf
    • https://cooperspick.com/files/sixedotikixofuzoberipuli.pdf
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/sanego.pdf
    • https://ruedi-leuthold.com/userfiles/files/72811639828.pdf
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45042166747.pdf
    • http://musikpark-live.de/userfiles/file/fokutupal.pdf
    • https://stratasphere.online/userfiles/file/78763896701.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/66bddef33bf4740c8a4ebf0f14a29d6a/wijozutobut.pdf
    • http://weforyou.it/userfiles/files/52842301160.pdf
    • http://www.sudaff.com/pics/file/19499195712.pdf
    • http://hotelgiottotorino.com/userfiles/files/20910882476.pdf
    • http://phdpecs.hu/userfiles/files/9140361365.pdf
    • http://ahkkpcm.org/userfiles/39852784937.pdf
    • http://carnow.jp/js/upload/files/zowemapifowozisaluwotiv.pdf
    • http://reginahajo.hu/_user/file/24344069919.pdf
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/61869935181.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/84dca752ad926f2605ad0e46554d0e8a/874708254.pdf
    • https://educationindiajournal.org/ckfinder/userfiles/files/83061701345.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=adb+one+click+installer
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ed.bin
5d629c14f067337791a4e6df9866ec150a496a26a72ede3f42af19d09442fc57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2ED 10576 bytes
font_01_sfnt_off0000fb34.bin
7409c3d34d4323848a753f475e05330d3f74ea5fa273ebd9c77981216077ec61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB34 17400 bytes
font_02_sfnt_off00012877.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12877 16792 bytes
font_03_sfnt_off00014088.bin
61b51b5e53afd64f0ca5ae6edcc3367ef8e13a64547c87dce2f0cd0b03de08a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14088 17676 bytes

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