Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c8af7c7d3d6ac2…

MALICIOUS

PDF

75.4 KB Created: 2021-09-10 06:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 68d0c9305763d85b87e58d8f43f4a73f SHA-1: 598339ea3ed547b1798a0823ed9c74aa5162d88d SHA-256: 17c8af7c7d3d6ac253ee9920238f53ca4ea3c005f6b16369e8f434e1f7e9d465
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links to potentially disposable domains, suggesting a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6599

Heuristics 5

  • 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
  • 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 https://stpatswatertown.org/ckfinder/userfiles/files/22160327252.pdf In PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210907_86BEA9A4150F4FB5.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/77077769605.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/23724513491.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/24443784054.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/22602388452.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/59348500109.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45071132540.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/18126972797.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/56858375681.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/71727557306.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/26501860173.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/30769514403.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/58504395774.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133ca05a48a9---jibevu.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/45111420889.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/42470663187.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/zixamewoleselo.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/kuluxorulemadenone.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/vojula.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/fudopexusuv.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/bisajasidexose.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/80312803151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=audible+premium+cracked+apkPDF link annotation
    • 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_off0000d448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD448 10496 bytes
SHA-256: 673ab6863023c8af7945956be20b142887bb394696613ddef789a46b8968ff11
font_01_sfnt_off0000ebe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 18016 bytes
SHA-256: 9ae828e568353d5fd28550e832448e7475ae5918216b0cac319c6f12a3e73364
font_02_sfnt_off0001196c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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