Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aada57f827a67a7…

MALICIOUS

PDF

80.5 KB Created: 2021-03-29 15:39:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55e3085d67969b88a5e2856e51929376 SHA-1: b656fafe1c54af0b4e8e17b959c961b5f15407d6 SHA-256: 5aada57f827a67a7c9a9670d9e26cf0c5ad588c6dff2c3611acbae1bc8838773
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a URL that appears to be a lure for downloading a PDF, likely containing malware. The document body, though heavily obfuscated, suggests a context of 'combination circuit worksheet pdf', indicating a potential phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/wix?keyword=combination+circuit+worksheet+pdf
    • http://karnaval.host/judogebopigisalaj4f10.pdf
    • http://suposisubi.22web.org/best_free_reader_win_10.pdf
    • http://lollipopa.online/96019259231q9y8y.pdf
    • http://meletemobu.iblogger.org/email_template_asking_for_performance_feedback.pdf
    • https://cdn.sqhk.co/diwelamu/iQWidji/project_manager_jobs_nyc.pdf
    • https://cdn.sqhk.co/dujagazatad/SMqidhh/paris_texas_film_quotes.pdf
    • http://hocostyle.ru/can_i_contact_facebook_to_recover_accountaq295.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gidibesuxi/54719586363.pdf
    • http://toseletos.epizy.com/fotided.pdf
    • https://s3.amazonaws.com/wibedubosateg/sawuxidaroxaramugudejidaf.pdf
    • https://s3.amazonaws.com/zonivezada/pagegobe.pdf
    • http://nixaruxabonijiw.rf.gd/66367148503.pdf
    • https://s3.amazonaws.com/rorives/wenide.pdf
    • https://s3.amazonaws.com/dabatisew/amsterdam_printing_forms.pdf
    • https://s3.amazonaws.com/pevarijidasalop/53415351343.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dec0.bin
df7db14ac73f8bfa149405071868a31cde9ffa30670bf9ea48989d1b55efb92b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC0 6668 bytes
font_01_sfnt_off0000ef4b.bin
2f8fded5c994872691e0ea0b79122ffdd68ed74cff0f700848eed228cdc2d94e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 2820 bytes
font_02_sfnt_off0000fb91.bin
8d9c177693a2ad11a60ea6e66049ef1a938e8221cd4e2bcbd6b1ab42dca5d129		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB91 5564 bytes
font_03_sfnt_off00010e5f.bin
82c2e99c92b667c2a92e1fca1d18cf7aaaa76911c1217115ff56592009f80b83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5F 11308 bytes

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