Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cae1bb3a61f846e…

MALICIOUS

PDF

79.4 KB Created: 2021-09-20 01:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f6cf1e1b7aaf442ecee994e82ca19813 SHA-1: cc27b48acc2b6a3a764dd17f67b50ac5aa6e218d SHA-256: 2cae1bb3a61f846e9722ae0b1b6bd934aa0a16eb6c01b4068e4826aa9275dd71
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics, including a high-confidence ML classifier and ClamAV. It contains numerous embedded URLs, with one specifically noted as a link farm on disposable hosting, suggesting a phishing or scam attempt. The PDF's structure and embedded content, though heavily obfuscated, indicate it's designed to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://garglob.ru/uplcv?utm_term=notepad%2B%2B+compare+dll PDF link annotation
    • http://consade.com/userfiles/file/kinota.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613685bd8f5ee---20097966042.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/buguxebu.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109031210586578.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/87532000310.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/zewawenizilunefapoloxevi.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/viruvo.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/59486584481.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/mozapiwegitobataselopego.pdfIn PDF document text
    • https://interconformity.ro/images/file/likukixikotinufejow.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/xepowipovavarobu.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/cc24nse8celm02llm2q8b18jr2/tomodixubolezabawexiz.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/77447281200.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/viduwofumetifulepupesifar.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/17456479981.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/wifevalepikodatiriponif.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/rakebiwuwoxu.pdfIn PDF document text
    • http://sissonne.hu/editor_up/47985231227.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/zetizezoronok.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/xelafusuruk.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/18143762893.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/dupugobikuteza.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://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_off0000d145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD145 18368 bytes
SHA-256: d4ab20d9fc39414e2de3ffb56c923ae0aa4f584b282c84acf2137b7b638bb279
font_01_sfnt_off00010137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001194e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194E 10288 bytes
SHA-256: 8702a364a2992b9cab41a346c111f38cb77743da5d83c2e93e5756234987b009

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