Malicious PDF — malware analysis report

Static analysis result for SHA-256 e681f1f66aebf994…

MALICIOUS

PDF

80.0 KB Created: 2021-02-27 10:20:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ba6387907283fcfab5bb3c7a2d058d91 SHA-1: 86640e1ccec43d1915d221ed94d1b505df15a6fa SHA-256: e681f1f66aebf994ac64172d9e134a286a94aa29c00c611c89876f504f8c64fd
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains text related to 'compound interest practice problems', suggesting a lure. The primary IOC is the external URI pointing to 'kuzutuzo.ru', which is likely part of the phishing or malware distribution infrastructure.

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://kuzutuzo.ru/aws?utm_term=compound+interest+practice+problems+with+answers PDF link annotation
    • http://iminn.ru/39745752570ccjzk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464861/normal_600dc47168efc.pdfIn PDF document text
    • http://trokot-roznica.xyz/how_to_say_hello_in_american_indian7r9uc.pdfIn PDF document text
    • http://damvglaz1.xyz/arabian_nights_bangla9rrpe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444850/normal_5fd11286e83f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453103/normal_603497c4e54ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391001/normal_5ffb1342b7dd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374535/normal_60214b57f198c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487903/normal_6029cbac2128a.pdfIn PDF document text
    • http://leaninrzpd.site/hp_laserjet_p4015n_driver_windows_8.1_64_bit92t00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420441/normal_5fc870471aa50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420451/normal_5fd9f6a146a60.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bubeto/breakthrough_prayer_book.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/makerere_university_admission_list.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/perujunokanosigu.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/guxiwivavonimikegi.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/27139774857.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/windows_10_iso_tinhte.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/brother_hl-5250dn_driver_windows_7_32_bit.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn 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_off0000e4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B3 5452 bytes
SHA-256: ea65d0eeb2d7538770151203e5a454e1746ac0ef2ad38c951c2d63f4a9b545e8
font_01_sfnt_off0000f711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF711 10916 bytes
SHA-256: 6442e11ba8dba664a61cf5163e263ba49799f1c62c618ccca381ba3f3960ce35
font_02_sfnt_off00011cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAE 16168 bytes
SHA-256: 13596defb2bcc6fc1048af8e1a4b019015f57a35384aba88f9e1637b8f94b635

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