Malicious PDF — malware analysis report

Static analysis result for SHA-256 8038cf4171c107fc…

MALICIOUS

PDF

87.8 KB Created: 2021-09-19 00:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6a45d0ff7d2b22cee4c8457a6d9ce555 SHA-1: c5fbd6e0cd632e790148f1c810ce4ed355c95498 SHA-256: 8038cf4171c107fc7f4ed10edcd9937705448eeedae1c7df034be92c2dc7ce9f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious or unknown domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting a phishing or spam campaign. The embedded JavaScript likely facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://fantasymusic.it/userfiles/files/84362233933.pdf In PDF document text
    • https://psfund.org/public/uploads/files/cms_files/pokadamamofi.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/35569437082.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/75052297958.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/jelodekawapadapimiwuzezor.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/10414888179.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/dimuni.pdfIn PDF document text
    • http://checopharma.com/upload/files/19575788325.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebd88a2870---98780976994.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/48383500031.pdfIn PDF document text
    • https://tipresentoio.it/images/file/90690052359.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/78754488656.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/14886066618.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/mifawijikofavitokesi.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/walalujumodisutedu.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090612451822367.pdfIn PDF document text
    • http://ducnhua.com/upload/files/nebubuvis.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/70553393395.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/gufarisevinubikuvapemup.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/woliwojeragaz.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/kozuwameramoki.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/zetufewenuzenov.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/54971261855.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/54754633461.pdfIn PDF document text
    • https://zhansq.cn/upload/file/pumepazuribo.pdfIn PDF document text
    • https://ikansambel.com/contents/files/judazudusimaxizizad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=six+thinking+hats+methodPDF 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_off0000ede1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE1 18964 bytes
SHA-256: ac36ca948b8be63ba8d5a356e8168768b7ba16b95b984555e7471cc3a636be64
font_01_sfnt_off00011fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB9 10820 bytes
SHA-256: e036c1cf99b52c4e26e79a135b9cca49c28a537055501837545813f827d17dae
font_02_sfnt_off0001384a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1