Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d743ae3f0a3da32…

MALICIOUS

PDF

62.2 KB Created: 2021-09-25 08:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: de08233a54f2986c58ca3e98741bdd5e SHA-1: 0a635d6ce0099ecc3b143c85ffa89bf7e01774e6 SHA-256: 8d743ae3f0a3da3290bde1ee4877109874fdfcb53047d9b66e639c7879df4e8a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5774

Heuristics 4

  • 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.
  • 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 http://vssteel1999.com/ckeditor/userfiles/files/desovapufijif.pdf In PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405c72e9c7d---8683447690.pdfIn PDF document text
    • https://demideopool.ro/ckfinder/userfiles/files/didamibub.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/xusorudowugujunit.pdfIn PDF document text
    • https://kaparatt.com/images/File/jufopakemevevulob.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/61553498097.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/35022661741.pdfIn PDF document text
    • http://glassick.com/userfiles/file/89973752083.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/kudowo.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/lezij.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/22757274871.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/51893812096.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/82632170610.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/lamaxojuzofisoxeb.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/sabitisotajito.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/17072578535.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/xubimezopejelonefiva.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/vonozisudulidinasavadade.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/sebemofomunadenow.pdfIn PDF document text
    • http://onlineauadms.com/ci/userfiles/files/buguxozu.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/8632243658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=final+fantasy+iii+psp+isoPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF70 10208 bytes
SHA-256: 983045b8c6e040779a147c877da76652dbae2e13c03e60202f999c88927bd59c
font_01_sfnt_off0000d672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD672 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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