Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5400468a1b20c8…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 22:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 117d672539c135a7617bf0f78064f2c3 SHA-1: 067836e71cd1d397489332d902e5fb6c31f157f5 SHA-256: ae5400468a1b20c85f627ecb6eaa7443bbbca2c3c1f8f4f9fefd44faa82577fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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.
  • 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://cructi.ru/uplcv?utm_term=absolute+rc+plane+simulator+all+unlocked+apk PDF link annotation
    • https://kligi.viart.lt/ckfinder/userfiles/files/58286594375.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/vedasimufales.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/lukaviz.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/63317700779.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/xazipexuxarij.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/lojizoxotiwabisan.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/82484209948.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/bufolikuvopen.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/doluf.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133dbcf1de47---19047480700.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/rapavumuxomagutosu.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/winuwu.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/36064217247.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/talud.pdfIn PDF document text
    • http://ranch.pl/files/file/37732524296.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/76677914336.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16306675509684.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/40248970294.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/zovobosilabogirojelela.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2daee1189---58814847817.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/dobobi.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/zijudewerisigeporilonemod.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/piwegaxozovo.pdfIn PDF document text
    • http://candientushinko.com/images/file/9387504183.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_off0000d501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD501 18264 bytes
SHA-256: f56eb593c518932e68347d865da4ce42f8122233a975bb932353fdc03db18d29
font_01_sfnt_off000104a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBE 10988 bytes
SHA-256: 52a7d97295330e7ace58bd6d5cbf993cd2d347ab7438f24a273bcde6cd9a0633

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