Malicious PDF — malware analysis report

Static analysis result for SHA-256 a924759ebc7cf9ad…

MALICIOUS

PDF

67.6 KB Created: 2021-09-24 20:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb173faa51074d55a037045628d6b671 SHA-1: fcb1e315e775d61cfc402dd9528e78191385c18f SHA-256: a924759ebc7cf9ad641b7c5c5a13ae89166a99fc625df8d6bfcf7730bcfc9f0d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-only content, and embedded action triggers pointing to external URLs. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of numerous external links, many on disposable hosting, suggests a link farm or redirection mechanism to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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 0 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.
  • 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://crysiq.ru/uplcv?utm_term=is+carrot+water+good+for+you
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/gavexakaxuf.pdf
    • https://matricula.arendic.cl/files/fivuxisuxetugidizak.pdf
    • http://gocep.org/data/userfiles/files/tinav.pdf
    • https://mobile-translator.eu/app/webroot/media/files/xokatuve.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/757b9121749c90dd5907278b50ba360d/luwunisaluduza.pdf
    • https://nanyangtextile.com/userfiles/file/22961281169.pdf
    • http://theemasternetworker.com/ckfinder/userfiles/files/goxepijafot.pdf
    • http://gachmenminhchien.com/media/ftp/file/86350621648.pdf
    • https://viktorina.ledoritulys.lt/files/vonanepopogoneriro.pdf
    • http://bndweb.nl/upload/files/tikez.pdf
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/89988766422.pdf
    • http://kco.su/userfiles/file/rexumulopofamopo.pdf
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/nuzopasu.pdf
    • http://markasib.ru/ckfinder/userfiles/files/78077635339.pdf
    • http://ntep2008.com/UserFiles/File/41600132452.pdf
    • https://drlanda.hu/user/file/tawogulaselez.pdf
    • http://irina-beha.com/ckfinder/userfiles/files/92414033731.pdf
    • http://tjsyjdq.com/v15/Upload/file/20219222055356303.pdf
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/tuwesa.pdf
    • https://tylbm.com/Upload/ckeditor/files/zoziveb.pdf
    • https://infotechb2blite.com/bot/ckfinder/uf/files/54030686402.pdf
    • http://klinok-saintp.ru/files/fidafula.pdf
    • https://keyword-lda.pt/site/upload/file/leloluv.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_off0000acea.bin
678820598aea4c9fc3887224eb2aa2e3bc6cc72263b172c68dc42de1f718c187		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACEA 10660 bytes
font_01_sfnt_off0000c565.bin
efeb18c70e614be18509a3c3991b7afec4ee2d339b9298780b30bc81c44ab6a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC565 14212 bytes
font_02_sfnt_off0000e8e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 16792 bytes

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