Malicious PDF — malware analysis report

Static analysis result for SHA-256 d95c5dc7fd8ded6b…

MALICIOUS

PDF

68.1 KB Created: 2021-01-30 06:46:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3f95544d8f27a71598bab93ba5ccfb9 SHA-1: d3e78514e45abfbceaa12e1cbed252073b99571e SHA-256: d95c5dc7fd8ded6b5040ec78b3fe56c06fe0a4052507d1aa4a9a732c1831af4e
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 multiple engines, including ClamAV and an ML classifier. It contains an embedded URI pointing to 'https://maypoin.ru/aws?utm_term=body+parts+activity+worksheet', which is likely a phishing or malware distribution lure. The document body, though heavily obfuscated, suggests a worksheet theme, aligning with common social engineering tactics.

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://maypoin.ru/aws?utm_term=body+parts+activity+worksheet
    • https://static.s123-cdn-static.com/uploads/4425217/normal_5ffae1c7334db.pdf
    • https://cdn-cms.f-static.net/uploads/4378382/normal_600b8e19aa4b6.pdf
    • https://static.s123-cdn-static.com/uploads/4374196/normal_6000c2eee8887.pdf
    • https://cdn.sqhk.co/komagiju/dibaigY/82700139232.pdf
    • https://static.s123-cdn-static.com/uploads/4488810/normal_5fc84660291b0.pdf
    • http://benosetib.iblogger.org/67077578948.pdf
    • https://cdn-cms.f-static.net/uploads/4494674/normal_600bc71febb37.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rujimidujek/android_marshmallow_apps_to_sd_card.pdf
    • https://s3.amazonaws.com/wejuvono/siribetepagofajene.pdf
    • https://s3.amazonaws.com/vonusirukete/academic_achievement_thesis.pdf
    • http://vonupov.epizy.com/rifag.pdf
    • https://s3.amazonaws.com/sefabe/workplace_grievance_template.pdf
    • https://s3.amazonaws.com/teximikamukubo/4487212051.pdf
    • http://xofunuxemijowex.rf.gd/34056177140.pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf14.bin
d75a148b21aa273744f946050a3f4a59a179dda6f43f64bc8ef9b4f927c80132		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF14 5496 bytes
font_01_sfnt_off0000e1e0.bin
f4816ca74a62ac07c47ae6e845056a3f69b17090ea5e75319b84eea12ae2f208		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E0 9900 bytes

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