Malicious PDF — malware analysis report

Static analysis result for SHA-256 7638926e4d4299a0…

MALICIOUS

PDF

68.6 KB Created: 2021-09-15 12:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6de9d7d57bb0a4a705e6b293771e9a3 SHA-1: 4faa5ff39a4bcf880ceb0a80e7ba931849cacb78 SHA-256: 7638926e4d4299a0a42bcc958b3888d81b50f6a97a10fba8220b30ac9c07ff89
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF exhibits characteristics of a phishing lure, including being image-heavy with a click-outward action and containing numerous links to potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and the presence of multiple external URIs suggest it is designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://monterroso-construpuntos.com/campannas/file/dotikosiza.pdf
    • http://sakem.org/userfiles/files/gefadufulemufo.pdf
    • http://areaengineeringsrl.eu/userfiles/files/10613117723.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141b3399e637---jexavurubafibomapetako.pdf
    • http://medwin.kr/userData/board/file/80379732860.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136121a5a3c0---wutaz.pdf
    • http://cu-mbc.com/ckfinder/userfiles/files/zujigonepetufenela.pdf
    • https://iphone-odklep.si/vsebina/80949208959.pdf
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/96521215535.pdf
    • http://scamps.biz/userfiles/file/15710980456.pdf
    • http://iphonedown.com/ckfinder/userfiles/files/sadapijidukikadaboret.pdf
    • https://bouveau-consulting.com/userfiles/file/21301521587.pdf
    • http://fedime.org/imagenes/82556385336.pdf
    • https://jairdefreitas.com/ckfinder/userfiles/files/rutusatigunan.pdf
    • https://hainutedecopii.eu/ckfinder/userfiles/files/xaxolemezidadeketukulis.pdf
    • http://quiltingacademy.info/fckeditor/userfiles/file/moperiwutikilitaxakud.pdf
    • http://circolonauticofavignana.it/userfiles/files/makafozamir.pdf
    • http://tsraccountants.nl/mailing/images/photo/file/visexaresabegebivin.pdf
    • https://karaari.leaddeehub.com/userfiles/files/zidaxifosonilewutupenak.pdf
    • http://happyorderfood.com/uploads/files/moroxaforavuritewaroroxu.pdf
    • http://benthanhsgfarm.com/images/uploads/files/wuxefutabupanixaxolip.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/fazadunokerolebosufirufim.pdf
    • http://keitbg.com/images/files/fakutotogazibebu.pdf
    • https://hahapediatric.com/uploads/files/202109081745251595.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=g+hd+cricket
    • 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_off0000b1c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C5 16792 bytes
font_01_sfnt_off0000c9d7.bin
04590ad1581a70fa9dc70adb7a262d8fec50d737030c86499d6eeb0dbd969d4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D7 14156 bytes
font_02_sfnt_off0000ed2c.bin
5923a3ba58f73982bb1c5c4ca11fdf93c490af8e00efa9f5ddb73eeacc03fc04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED2C 9996 bytes

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