Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f6c89f2e645665…

MALICIOUS

PDF

67.3 KB Created: 2021-09-27 09:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b2ca3ed7331b3902ddfd168a978c919d SHA-1: 076019e41e77d5e1493e8b6cf5565f93f7e2ea4a SHA-256: b1f6c89f2e645665638821dc9ed2f0a7c0af1b8bed7066a6b19546be2ae273f4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, indicating it is designed to redirect users to malicious sites. The heuristic 'PDF_IMAGE_LURE' suggests the document presents as an image to hide clickable elements, a common phishing tactic. The ML classifier and ClamAV detection strongly support its malicious nature.

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 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.
  • 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://ketchas.ru/uplcv?utm_term=the+last+wish+andrzej+sapkowski+pdf PDF link annotation
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/97061880492.pdfIn PDF document text
    • https://vendax.ro/files/file/83957540542.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/22799577099.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/90690358664.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/rubadejasepatik.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/jukumuwewono.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109131018044937.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/518534698.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/bejiwope.pdfIn PDF document text
    • https://forumsevens.com/images/file/fegilu.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/62695827510.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/46528305000.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/nenarorawugividos.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/17703324824.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/340b95a073cf8fca1bb8f07a66f73d61/81221753116.pdfIn PDF document text
    • http://hocomesun.com/upload/kubaruzuvefaridaja.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/defufapipulopiremaxijo.pdfIn PDF document text
    • http://tzsunup.com/upload/kowuwu.pdfIn PDF document text
    • http://klinok-saintp.ru/files/dofojifenaxaju.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/bfb8efe88073c621f12e8e4573f8d477/12017128147.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/fubigi.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_off0000ab44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC356 14252 bytes
SHA-256: 660abfc81387dabf81ed47d59894df495b4190651220ac18984d9bdecb68ecbb
font_02_sfnt_off0000e6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CE 10928 bytes
SHA-256: 6974305936839578507b7e7558d7e1049e140cc25789f48ce614cb0fe29a7623

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