Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96eb377af22332b…

MALICIOUS

PDF

69.2 KB Created: 2021-09-21 18:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 50fdd5fb214848604639a68f915a10b7 SHA-1: afaf40b295e87637d864ae6e099a5d546635aafc SHA-256: b96eb377af22332b68131feeac76a100df7ac2091cd057628714481e6a979461
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs pointing to a link farm, suggesting a phishing or malware distribution scheme. The presence of PDF-specific rules like PDF_SEO_DISPOSABLE_LINK_FARM further supports its role as a lure to other malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mavibusiness.it/file/posesilejojeke.pdf In PDF document text
    • http://yetisirkaucuk.com/firma/files/jegavozakikufofexo.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/ninokupipunebivigezisuvo.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/65810712433.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • http://sklepjola.pl/userfiles/file/67731452425.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/rizizatenujagatez.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/97810010285.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/11770561208.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210913_A162DB300D27A9E3.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/bezebolosepa.pdfIn PDF document text
    • https://fasaac.org/temp/files/lubalaki.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/gisamewanujibafa.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/65429399168.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/rabejojuwoligabolevutas.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/32265435168.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/nubeje.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/wunaxisulezemunaxoga.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b0ed868881497fc14a36afbc7a248e37/77237869643.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/makozejunurabirafusu.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/78817476854.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161325ab9ba089---fonuweperofonasasadiso.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/24531636830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=online+video+to+audio+converter+and+cutterPDF link annotation
    • 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://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_off0000b08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08D 15372 bytes
SHA-256: 4dfc3013ca1f358d84b0a66be5fccd818e06a6a303f8df809bc0de0adf2a7996
font_01_sfnt_off0000d775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8C 10384 bytes
SHA-256: 8a6e891917c420969ea8729b74b45eb84730e73d53cb5b3260f7c857bcc38293

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