Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb33c46a2c1c0b7a…

MALICIOUS

PDF

79.7 KB Created: 2021-09-09 11:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 493de1a16ca808d1fea3ad5247f595f8 SHA-1: 270456d4e51f6bf122d572c0c0aa5a7aeb296bbd SHA-256: fb33c46a2c1c0b7aabdd4a32706b751c99df8bf9874014e248d298e60a63d43d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The PDF also contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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://queure.ru/uplcv?utm_term=children%27s+stations+of+the+cross+pdf PDF link annotation
    • https://altstudio.be/app/webroot/uploads/file/motopijaga.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/tuxisaboxidus.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/repogatukilupalapowe.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/tazopubunekujugegot.pdfIn PDF document text
    • http://shahgrp.com/uploads/zozidobufasi.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/sugigodanegezidifukawo.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210907091012.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137c73a51c73---dabajofebowufig.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/zakobe.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/98448208774.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/26426326377.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/56253149521.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/23061333130.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/zuraxujosalot.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/99953163751.pdfIn PDF document text
    • https://qkon.ca/images/file/mixewelu.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/tixurijadofuj.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/64621386727.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/gevewavukunarexexos.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/webevetonerevalemok.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d60c6709f---jorodizuvi.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/derivulesufuguxedezoluse.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/nexiwawapivelibe.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_off0000d2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A9 17464 bytes
SHA-256: c13e93f3569136fa5e3f3c405d74dac702cd8365572133f86756d055a216a99e
font_01_sfnt_off0000ffaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C6 10784 bytes
SHA-256: 7c8ca59b07b8daa8b0bd02469654e9c2777a241a2bc3d16a64eca5fb42700024

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