Malicious PDF — malware analysis report

Static analysis result for SHA-256 224334ada0e64335…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 17:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8d2b8bd1eca8505b2d84a7d1555dcc82 SHA-1: 4d273188db7c57a348abe1511dee3b4c1354a75d SHA-256: 224334ada0e64335136f991624c49dcc2220ca248e6dfdc76dbc9660e0fc1899
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The high ML classifier score and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs, many hosted on potentially disposable domains, suggests a link farm designed to obscure the ultimate destination and evade detection, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://naszymsladem.pl/upload/file/11732652008.pdf In PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b09740b488c925553ec367f852e1b72a/pejakagakelevaz.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/53025274256.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/perawaxinakorus.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/zuvogawilesopakuwoladu.pdfIn PDF document text
    • http://dejede.com/userfiles/file/80581496664.pdfIn PDF document text
    • http://bamila.vn/luutru/files/28032913230.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/babux.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/mamajelopugafupetugagu.pdfIn PDF document text
    • http://topp.pl/_topp/file/1917137184.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/fenenolimabojevivog.pdfIn PDF document text
    • http://grandfiltr.com/files/file/68064811468.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614162ddb7037---46558828264.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/73925354779.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/xofavi.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/midixoxeja.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/34989651468.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/kosodulunuxi.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/93320854326.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/xudoxe.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/82390085800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=kindle+paperwhite+android+appsPDF 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_off0000d977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD977 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF189 19848 bytes
SHA-256: ad7b5bdd23ce5e49391a7490d1332f10b05455bf0fa84eb122e17f22ea25dec6
font_02_sfnt_off000124e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E2 10568 bytes
SHA-256: 9702e7086a4899fb668ccc9408194e4e08eb8dd0cfe0253b07fde785e28bf571