Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2cf3f0e4b5cda9…

MALICIOUS

PDF

82.5 KB Created: 2021-09-14 06:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f9bf1a36bb03cd131cf6c3541b06bba7 SHA-1: 41790077281a8933c6b7f476b885c612e4c2aaff SHA-256: 4d2cf3f0e4b5cda97996488f4a1aa540874c881f8798c368a7c3a9587551f44f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to potentially suspicious domains, combined with the 'SE_CALLBACK_LURE' heuristic, suggests a phishing or scam attempt. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the overall pattern points to a malicious PDF designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://bertoniamministrazione.it/bertoni/public/file/23495933652.pdf In PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/wukupurosatatapuxono.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/panefan.pdfIn PDF document text
    • http://laserinnsbruck.com/static/gugafixuk.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/pexuri.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/sovijalutudalojofu.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/kiwovilejazujazimonuweji.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/bumamijodud.pdfIn PDF document text
    • http://salespate.com/userfiles/file/62646897446.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/83433756918.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/92025653448.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/wenarakusege.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/47190404442.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8250e4b589dff2326e8745d98b14a03e/povet.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/23700347241.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210905_19E800445F64FF15.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613af6b60f0f4---nomijowigonemuwonutugibe.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/dosiwepesuxen.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/73421217436.pdfIn PDF document text
    • https://businesslife.com/content/files/giziwegizototolin.pdfIn PDF document text
    • https://hiroyoung.com/data/files/80193892027.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/42492739961.pdfIn PDF document text
    • https://onlinendttraining.net/files/73906783882.pdfIn PDF document text
    • https://irrisyst.eu/files/file/sigok.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/19150074297.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/biduda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=lingua+latina+familia+romana+pdfPDF 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_off0000db2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2D 10600 bytes
SHA-256: 7350bf03374e8423163c59d56db7936a30eb055f49cf1ccd6b9132977ddc2245
font_01_sfnt_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 18788 bytes
SHA-256: 92433cae567d06e68bb11703e1539e6f47737e358c0c581f3b9e24923292a979
font_02_sfnt_off000123d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1