Malicious PDF — malware analysis report

Static analysis result for SHA-256 710938bedf48da06…

MALICIOUS

PDF

74.8 KB Created: 2021-05-18 04:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8ac6ed66a0714465f3d85ea5f98af97a SHA-1: 20284a3f38568812cd65d815197f66f0008b6f3f SHA-256: 710938bedf48da069181dde376d13b4f6f5386f3b3b296b417a557e964627ad3
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to 'https://ponafet.ru/strik?utm_term=manthappa+medicine+textbook+pdf', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a textbook. No scripts were extracted, but the presence of external URLs and the ML detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=manthappa+medicine+textbook+pdf PDF link annotation
    • http://xokoden.22web.org/coding_interview_cheat_sheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369493/normal_606a88a19cceb.pdfIn PDF document text
    • http://delavivajew.22web.org/12217184980.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385038/normal_605f94d127f5f.pdfIn PDF document text
    • http://midorezif.iblogger.org/46722040866.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/bmw_f30_320d_automatic_vs_manual.pdfIn PDF document text
    • http://kewupuz.rf.gd/rivonenelug.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/mijamojesije.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/93634721058.pdfIn PDF document text
    • http://vofabij.epizy.com/los_materiales_compuestos.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/define_acknowledgement_in_report_writing.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/zuwozigoke.pdfIn PDF document text
    • http://baniteb.epizy.com/31457518738.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/bb_z10_android_apps.pdfIn PDF document text
    • http://pedojup.rf.gd/audio_video_mixer_cutter_app.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://scripts.sil.org/OFLIn 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_off0000d303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD303 5368 bytes
SHA-256: ae6846ec42cc97d0065b6c869b7202e9b6f500c3ad126ed922f1da03ada745b3
font_01_sfnt_off0000e52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52E 10388 bytes
SHA-256: 524e65abe0f27c0eb27a2b6b0aadc4a9b42d6f845a928ae04b287603e208d41e
font_02_sfnt_off000108e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E0 16164 bytes
SHA-256: 6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3

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