Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7471db21aca01c…

MALICIOUS

PDF

76.2 KB Created: 2021-09-22 13:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e5a379e5d280db98a90f385f85ea2b0 SHA-1: a8160861676e1c44e15c4954c41807dc41ef7a88 SHA-256: fb7471db21aca01cf1718bae8c8b319b9a5d8690554d0c4c5621fb80aa80d478
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing lure or download a second-stage payload. The presence of embedded JS suggests an attempt to exploit PDF vulnerabilities or redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://abwingsjanaf.com/uploads/files/muxidujux.pdf In PDF document text
    • https://nangluongvada.com/uploads/files/12117331216.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/jivoki.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/lamozef.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/xejewavegonanuweba.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/sonegetidixazutu.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/wupujeme.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/69069514605.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/fiduro.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/91461759581.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/pevewilo.pdfIn PDF document text
    • http://ergakiland.ru/files/files/babovukike.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/88484008586.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/zubaveke.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614708b2f0191---39793544461.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/90338435927.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/wimobojor.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/xasekujevi.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/bumuvidovunoxofov.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/216094428.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/6206127211.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/94167626293.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/21162865987.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/13172340972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=upgrade+from+android+to+iphonePDF 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_off0000c674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC674 17124 bytes
SHA-256: 6acc05037ea286742a6ede6f04bd7d731b664b3aa12965c319a9617e09a4e215
font_01_sfnt_off0000f2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C5 10740 bytes
SHA-256: 20dc9dccaf22c63d3bcd1215abf74c132c3f291970fedbb8816f55069fb40077
font_02_sfnt_off00010b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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