Malicious PDF — malware analysis report

Static analysis result for SHA-256 551b6196655e9521…

MALICIOUS

PDF

89.0 KB Created: 2021-09-15 16:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b74ca7c5db294bd557257888907ce2f6 SHA-1: d3bc607bf5773068e1fbe405fa90784a72be86d0 SHA-256: 551b6196655e9521b6e043ddc03d36cba3cd3cb0aeec0bf72d536fed9ee69543
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://lesen-und-schenken.de/userfiles/files/44531961545.pdf In PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d8f4970832cd3997eb5bba18f5ae1c53/94413280518.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/kafenoruxo.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/webasidebodimaboda.pdfIn PDF document text
    • http://th-hl.com///upload/files/ruwipapo.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/xodewokokimil.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/39263905439.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/23236781540.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/logovinudebilagexi.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/jijiriwosonefomipipasupe.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/wesotalof.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/jewef.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/ruvorepak.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370195efc59---wowidijoliwobizosebat.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/32294058524.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/18505558095.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/60106540978.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/dibetuwobigiguzezari.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20219685743.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dimunutafenifefuzin.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/92700986655.pdfIn PDF document text
    • http://spharma.ua/files/file/92558269648.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/molozudukipikobag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=clash+of+clans+hack+ios+apkPDF link annotation
    • 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_off0000e900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 24296 bytes
SHA-256: 69066efbcd299c744cef86bf583ea09237b33d71671d17384366f73a7e2fdf42
font_01_sfnt_off000126fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FA 10372 bytes
SHA-256: fdbf1409aa6e627c49efd85ee69be9ce50dd6e7621134eb4b5326ec2e95e5376
font_02_sfnt_off00013e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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