Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90513acc6939993…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 14:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f5d70c758e022124070b6abef3b19794 SHA-1: 4efd2cea4fc047506f34f2e96504f031d6fbbeb4 SHA-256: f90513acc6939993b3cf1706808cb9c9850ddd98851ee0ad35e0c352cc1ceb0e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://svsteinfurth.de/radsportfiles/file/vakozijuke.pdf In PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/19100976465.pdfIn PDF document text
    • https://mcsfood.com/images/file/46939806474.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/16810173831.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/begesipagawaroloviw.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/tiwelazok.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38752727302.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133de6b5c8a2---zurowurekizopore.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/79271107990.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/33918280361.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/rugejozomudojukut.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161340673730a9---97555033617.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/6948147734.pdfIn PDF document text
    • http://tayles.com/uploaded/39792702192.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/pewekagebikijemuki.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/nurejovakagilipututok.pdfIn PDF document text
    • http://tzsunup.com/upload/rojomagexezanazu.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/44615636734.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/nobanixokexipi.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/43258998978.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210909_10D2868DCDBF64F0.pdfIn PDF document text
    • http://leton.pl/userfiles/file/95273373901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=gta+v+san+andreas+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_off0000d8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AC 17388 bytes
SHA-256: 0f96207faf896363c2f3a12dbd4854fa1456b92f5eb56e723848534ab090c977
font_01_sfnt_off000105ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AD 10324 bytes
SHA-256: 6088617db38e82edae4cf346c6a77915bf3531d907402ea10d120e36bf4b365c
font_02_sfnt_off00011d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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