Malicious PDF — malware analysis report

Static analysis result for SHA-256 be2552d82b7c89c4…

MALICIOUS

PDF

77.3 KB Created: 2021-03-01 17:30:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b87feee28004b4a907d0c9316d03ac9 SHA-1: e5985382b31d3bc594e07ea95d9a5bd389470c3e SHA-256: be2552d82b7c89c49d2e9ed8dd352e36378bd93791ce346d64b7ec01a2d3107b
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'kuzutuzo.ru', which is likely a malicious domain used for phishing or distributing further malware. The document body, though heavily obfuscated, contains text related to 'Walmart black friday ad', suggesting a lure to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=walmart+black+friday+11%252F14%252F20+ad
    • http://jiviruke.iblogger.org/kizubowatexuwuxawelezem.pdf
    • http://selizixid.iblogger.org/89555200736.pdf
    • http://filemarker.store/95077662363a7n5e.pdf
    • http://mini-cam1.club/economia_comportamental02b62.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rimejiguvif/brown_sugar_movie_free.pdf
    • http://maferodo.epizy.com/pexifofudowebu.pdf
    • https://s3.amazonaws.com/vogubivajavofu/bluetooth_para_pc_windows_8._1.pdf
    • https://s3.amazonaws.com/mokixetat/buzobibevu.pdf
    • http://lizusesujujes.rf.gd/inlet_beach_manasquan_surf_report.pdf
    • https://s3.amazonaws.com/mibiwivanetuj/pizalisuserosigu.pdf
    • http://pugagewuda.rf.gd/67591211704.pdf
    • https://s3.amazonaws.com/rujabepifar/41347661474.pdf
    • https://s3.amazonaws.com/nuxulikiwab/fur_elise_piano_score.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_off0000ecae.bin
27c79d0443ca4242b47c31149ff90b3249a3c282c37dd97d9aeb43a69e9b250f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECAE 5756 bytes
font_01_sfnt_off00010064.bin
2179a825ee8be8addd36000ad5046b761fa2a6a76843a5377e8709c2dbbcc48c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10064 12568 bytes

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