Malicious PDF — malware analysis report

Static analysis result for SHA-256 243c2aa125445337…

MALICIOUS

PDF

98.2 KB Created: 2021-05-22 04:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3a41a3c0826b2342c97d1e1a9d032eb SHA-1: 84bfcdb3fcfe16cbddae3de2a36094dd53a2d232 SHA-256: 243c2aa125445337c199d56352d272f1efe46ca718047fd7fa46e58667669629
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various websites, suggesting a phishing or credential harvesting attempt. The document body, though heavily obfuscated, appears to contain keywords related to product resets, likely a lure to encourage interaction with the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://spherule.org/wp-content/plugins/super-forms/uploads/php/files/892612b0515a5cbc5bca0936e516307e/68526895459.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab137fe85---vidomukug.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160723cbb2772c---lozupefivofifadavu.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/10903657606.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/uk88094p7o2j3g6p59a139dgi6/61574776376.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835e1ced7c9---wuzudasunemonorexudutenex.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f52900effb---tituvizofajazunanirid.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16097cca63761c---3544177272.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa3192f86d---nojufimafodifofavotim.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/774d89556cdd4990e28835d58bf4e635/zokakufumuwupivu.pdf
    • https://amitadevnani.com/userfiles/file/1917149812.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/53ed0af11f8a122aa955993d51cb983a/nerilivuvivetiropuxed.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c156ce2921---35193689910.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee15bebf72---xifixofowosewikumuk.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/b7uioacubgc3r71fg6v36rl73h/12479360226.pdf
    • https://banghenails.com/upload/file/2088499610.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sandisk+clip+sport+mp3+player+hard+reset
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f86.bin
8560f90118b931f679ae2fe451dd749f2573cd56ac07605b946d628637564dc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F86 5748 bytes
font_01_sfnt_off000152fd.bin
1df830ba336d1779d6d4d91b7c86ee22fa6e1ccc55369afb449f9dcc54155a7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x152FD 13808 bytes

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