Malicious PDF — malware analysis report

Static analysis result for SHA-256 817cb43139e06f3c…

MALICIOUS

PDF

67.7 KB Created: 2021-09-30 17:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a78d02c0962ae43bd18337d72f6592d SHA-1: ceb0a369de16b8e1fa1a596edd39ecf87581a157 SHA-256: 817cb43139e06f3cbaa67f7aa9ad9e6f29c48c3467bce3101d8e834d3a308021
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. The document structure and URL analysis indicate it functions as a link farm, likely directing users to phishing sites or malware downloads, consistent with a spearphishing attachment attack. The embedded JavaScript stream is a common method for executing malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 67 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=android+app+for+doctor+appointments
    • https://konyaalotaksi.com/userfiles/file/49008915728.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161320163e12ec---15845322714.pdf
    • http://rfaaa.com/UploadFile/file/20210923042959893.pdf
    • http://teedinmaesai.com/user_img/file/rakawiw.pdf
    • https://segurodegranizo.ar/noticias/fckeditor/file/kegusezi.pdf
    • http://gimhaejazz.com/fckeditor/userfiles/image/35676837973.pdf
    • http://healthywithhart.com/res/file/40004798814.pdf
    • http://yasaitogo.com/uploads/files/73109724258.pdf
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/71762516494.pdf
    • http://agriturismocorteerbatici.it/userfiles/files/51527207105.pdf
    • http://tiquital.com/documentos/file/mowutamoju.pdf
    • https://gabinetpro.pl/kosmetyczka/krakow/files/gujitimu.pdf
    • https://jagominum.com/contents/files/dadafagafamutilubovepupa.pdf
    • http://sincaremedicaltour.com/js/upload/40450338992.pdf
    • http://poliinc.com/upload/files/bomasepukefeveke.pdf
    • https://relaxbotanika.cz/ckfinder/userfiles/files/xezatosulaxaxupowiju.pdf
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/77559571529.pdf
    • http://giaphatmed.com/upload/file/nozipure.pdf
    • https://araprinter.com/ckfinder/userfiles/files/fufowut.pdf
    • http://vrakskodamnetice.cz/file/86976713377.pdf
    • https://triangle-electronics.com/assets/userfiles/file/50112378093.pdf
    • 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_off0000ab3e.bin
177b0f3ffc7ff9a3adb02c80d3b287cea64f48a5c2790e655c3873d0926a3d92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB3E 14344 bytes
font_01_sfnt_off0000cf1c.bin
37472624fe370c2bdeda1c9c1c14824d88c2df891d1a111803baba4d23d28ff9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1C 10716 bytes
font_02_sfnt_off0000e7bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BB 16792 bytes

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