Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b369cd16faabcb…

MALICIOUS

PDF

74.9 KB Created: 2021-09-19 14:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c94111179097f46a2ea61b7f226b967b SHA-1: 375e03ddcc63ebc12058e9e83f7867251c30d4d2 SHA-256: b2b369cd16faabcbb6c5d8fd9c3df1488276fdc4a51edfb8e4108ffed76c1c8d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying a pattern of disposable hosting and a high number of distinct hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://aotwresort.net/ckfinder/userfiles/files/74559564927.pdf In PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/54722962310.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/setolivusapegujazadujam.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/bigijirejowiw.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/vedopilarinasevorowiko.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/77660283426.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/fefidowisaniguwumedobito.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/27311883533.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/girijakoguludutimigarido.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/19758908517.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/erkn3llifd149cviokroje68ar/vizuxarexirozijot.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/junolumi.pdfIn PDF document text
    • http://zerosquareonline.com/file/30492664192.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/2885182233.pdfIn PDF document text
    • http://asid.rw/userfiles/file/mipuv.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/nifudamulutapadiguget.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/41938376120.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/jafakokuvinobuvajedewa.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/87320274955.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614006e335643---boropizek.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/94218280610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=chrome+maps+appPDF 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_off0000c309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC309 17024 bytes
SHA-256: 8ebe1e524d751eb52276d98b075de5d77f8a6de525424f1a155358f4b0a803c3
font_01_sfnt_off0000eefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFD 10208 bytes
SHA-256: d7f86417a7c50c2f32e929a5b796840a665256ce131007a677c30c54043d10f1
font_02_sfnt_off000105ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1