Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3b9c5dfccbace6…

MALICIOUS

PDF

73.2 KB Created: 2021-05-01 08:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e57a1b23cd0b6e0f6abc1d555d2e24f3 SHA-1: 7016ccfd9958de6f81653bad469e1508780b82fb SHA-256: 3a3b9c5dfccbace645d5f8965c2428103195f3b7c41e9aee4d97e541bff72ee2
96 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV, with a high risk score. It contains embedded URLs that lead to potentially malicious PDF files hosted on various websites. The document body, though heavily obfuscated, suggests a lure related to 'geometric constructions worksheets pdf', likely a pretext to trick users into downloading further malicious content.

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://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/7446g487ff22nppt33pfhrtu40/nezorajoselokeri.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/f9763c85edb9be6e553da3249f4e0cbb/zijifufawisabigana.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886065aa60a---kataleradiro.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c24d3030f---xinuri.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/88d6jornb4n896jhptocbq6eok/jewaxuwubigaj.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c75d754ce5---gelewulinumitefotamaj.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/564ad35b5906830f1627de541d20ac84/mazapodenewijilufonimij.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/arc50qovkv3jm0rk04pgmpobm9/24890655976.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079750c35f39---jekafi.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/2b30k5il2tqju8if5jg4ee6qka/11437247288.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/07ldd2ajga9390h6kb9pntquf7/dapazawibova.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/3114b10aee29cc3ec956b8935385f991/muzizowazeniriduka.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb9e91da17---44963412383.pdf
    • https://alshamiltrading.com/alshamilfiles/file/dugebixe.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076e4539c7f0---91811401383.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/s85j1h92qdbrl0o721ddboukvv/fasidamatemivogil.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/cddf79c32131b3672212b98d3e4591fe/vonujenole.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c5288ee818e60f51b832fc949d4b0740/35846699176.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=geometric+constructions+worksheets+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_off0000e184.bin
04ce4a894ca5c1d6877a2775660344e735c36ae303b12e41e6fc0321a99c21a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE184 5340 bytes
font_01_sfnt_off0000f3a3.bin
650cc08abf431d9f0c27aa656fc9e36f52c5b1cf1a5c615de459777b55123e71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A3 10536 bytes

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