Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54a4764209c0efc…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 01:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cca3b9c01e68942c16797d1205230cc2 SHA-1: 65916be11025a130452f512d17026ae57a2e38b6 SHA-256: a54a4764209c0efc62a9683de9ff5291a55356072f3a969b1dead710168ad458
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and a phishing trojan. It contains numerous embedded URLs, many of which point to link farms on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://pc580.cn/upload_fck/file/2021-9-8/20210908085521971286.pdf
    • http://flightshop.jp/images/blog/file/68937457447.pdf
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/36102863635.pdf
    • http://inventory-acepipe.com/images/uploads/files/sogakopepumovowiboto.pdf
    • https://mokhalasati.com/userfiles/files/wepuvajurakijemuxujowalo.pdf
    • http://radecznica.pl/userfiles/file/60469709710.pdf
    • https://profipreklady.cz/www/ckfinder/userfiles/files/bapanojijatesakiwivaxij.pdf
    • http://zamaro.cz/images/fcke_files/file/zevekogot.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/vegaboline.pdf
    • http://vekosgroup.ru/userfiles/file/2910516674.pdf
    • https://stopserv.ru/files/file/40885970654.pdf
    • http://www.clc-engineering.com/siteuploads/editorimg/file/85814161902.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/72fe8e3eef3eedcc7fcce532881aa97b/48773090094.pdf
    • https://braindevelopmentmaps.org/userfiles/files/saduveder.pdf
    • http://avandcie-energy.com/ckfinder/userfiles/files/zekategekikagujipobavu.pdf
    • http://redskap.ru/userfiles/file/pegozufa.pdf
    • https://unitedfightalliance.com/ckfinder/userfiles/files/nukunojaw.pdf
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/12454057931.pdf
    • http://toyotarent.kr/FileData/ckfinder/files/20210920_0645A53ABA8EED11.pdf
    • http://sun-green.eu/ckfinder/userfiles/files/3704635824.pdf
    • http://www.insight-assessment.com/ckfinder/userfiles/files/86892175445.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=root+my+phone+apk
    • 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_off0000dd94.bin
d0701ae2f460fa5bddc136fda999ea4b56ed91aa196c23bd1309df1a719f93f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD94 10360 bytes
font_01_sfnt_off0000f4dd.bin
b4c6dc0b0ca4bade2f622afe2a5829cb615560d2e58f2f001e3758b5415276d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DD 18160 bytes
font_02_sfnt_off000123c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123C0 16792 bytes

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