Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde26d09a9c5ac19…

MALICIOUS

PDF

70.3 KB Created: 2021-09-10 02:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9211fbbf0a86b0f4015bcecc838f8d43 SHA-1: 344d9a06f20c6027226b0bd8c67a71535a631a57 SHA-256: bde26d09a9c5ac19bd963ed07a0ea6425926a9cebffe72885db6d002f7081fa5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or redirection mechanism. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports its role in directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://caopump.com/admin/userfiles/file/76010685091.pdf
    • http://svadbavmoskve.com/content/xuploadimages/file/63988260326.pdf
    • http://findmecakes.com/userfiles/files/gonelopigolupipe.pdf
    • http://lineshare.net/upload/files/20210903134808.pdf
    • http://dungcumaymoc.com/Images_upload/files/35828169475.pdf
    • http://chi-kara.net/Upload/files/jaxulapolibov.pdf
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/36296126606.pdf
    • http://g-shocktou.com/user_file/file/84499368460.pdf
    • http://logtech.cz/foto/Image/file/zovujoxuvigimal.pdf
    • http://hamyarsanatco.com/ckfinder/userfiles/files/nunabotavuwusotaloz.pdf
    • http://vetportonaccio.it/userfiles/files/niragafasu.pdf
    • http://playitdirect.ca/ckfinder/uploadfiles/files/vevepiruluzot.pdf
    • https://ifbscalidad.eus/files/galeria/files/6710990459.pdf
    • http://mediedil.eu/userfiles/files/fakizulemaf.pdf
    • http://gartenmessebau.de/uploads/files/82793012136.pdf
    • http://getem.pl/files/file/23956016209.pdf
    • http://stroyindustry.com/userfiles/file/86575193163.pdf
    • http://eis-pieschel.de/UserFiles/File/27273712269.pdf
    • https://terlickodds.cz/www/www/fckphotos/file/filebeb.pdf
    • http://merrygoldholidays.com/ckfinder/userfiles/files/sijinugos.pdf
    • http://gesundezellen.com/neu/userfiles/file/92353820156.pdf
    • http://emeat.ru/var/files/28953239655.pdf
    • http://budropol.de/Upload/file/jufasoxer.pdf
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/19487274323.pdf
    • http://dentalcenterstudio.it/userfiles/files/35149597146.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=me+before+you+movie+torrent
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b352.bin
d423668fe501a3b981252666517b413664f1aa30952ba1e702c33225148da407		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB352 15968 bytes
font_01_sfnt_off0000dc6a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6A 16792 bytes
font_02_sfnt_off0000f481.bin
31908ad53942f8354dccebb2d543c575a095b17297c46320756893cf23d92e4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF481 10412 bytes

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