Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce74b4757a655a11…

MALICIOUS

PDF

80.8 KB Created: 2021-09-10 12:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2c5d76c998fe02f6f31a2167b1799571 SHA-1: 72aaf27dd23ed415c097b38da39803c02830d2c0 SHA-256: ce74b4757a655a1194bad6c4c5712fcc6c1e81a224849cf562f8eb64aeff4b24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, characteristic of phishing or malware distribution schemes. The PDF structure and embedded links suggest an attempt to redirect the user to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=how+to+remove+a+forgotten+pattern PDF link annotation
    • http://kant21.com/userData/board/file/molorofenekuwuwusizo.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/89039582711.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/jikonibi.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///zifegaxuk.pdfIn PDF document text
    • http://youil.org/userData/board/file/zasepigutesafirexomag.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/rulafose.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6c547f1692b889f6081512173964af7e/13368809859.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/joduruwefedevubufar.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/dinewugasujodulegez.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138883027358---wowugutuvosojikave.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/lijagitotowi.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/81083678909.pdfIn PDF document text
    • http://aquatherm-graz.at/files/33384403092.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/49709442594.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/giwezavepigewatagu.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/jalemorujiwitegoburodibut.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/balag.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/zefejukilen.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/zarinekosiz.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/48314687085.pdfIn PDF document text
    • http://pronobile.com/catalog/file/98827004335.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/gipawixetefinavub.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/608216394.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_off0000d8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AE 17344 bytes
SHA-256: d0e6f078b27beba180c7e7e038098bb2801b44567083e392318f30efbfd335d0
font_01_sfnt_off00010525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10525 10536 bytes
SHA-256: 6bcbdbe951cc5b29fc74395b8c73c33008bac86c9204e862222578f080c090c0
font_02_sfnt_off00011d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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