Malicious PDF — malware analysis report

Static analysis result for SHA-256 40fd4b7d6c9210a1…

MALICIOUS

PDF

64.0 KB Created: 2021-09-29 11:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 53eed4d82f5c678a29eefc78991f33db SHA-1: 1d8bbbf01fbd4972798c31eab72a1f21579f3715 SHA-256: 40fd4b7d6c9210a1f6d9b38be1489c78d1b124972b6bc1d65dc49b01c6e1945b
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5956

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 http://seanmore.com/userData/board/file/54004359058.pdf In PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/givogakimefaned.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/roxutalogo.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/50785429089.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/13841991631.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/bimodetitexuduwij.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/losatuzejesikopuwofan.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/3353712435.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/samazulesasegoxiboviduw.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/ranimexolo.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/zipatisixowifaxenuze.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/wajalu.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/wekobofuxiporiludodefiji.pdfIn PDF document text
    • http://chinazzjx.com/d/files/44516873270.pdfIn PDF document text
    • http://lqhuachen.com/uploadfile/file/2021092914511573499.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/fejemajud.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/21175579250.pdfIn PDF document text
    • https://profesa.net/userFilesfile/64745486322.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/02c3abcfb1e82196f6a609057a423bec/sadojelimubojigot.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/ximavebipiwevuxuxovivati.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/zefeduve.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109010021084649.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/54910604668.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/78946173191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+get+screen+resolution+in+android+programmaticallyPDF 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_off0000b300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB12 15976 bytes
SHA-256: fc8c8a73207b7a6d42973fba3b78493fee4b4f03d7cb3535ddfcde766b86d3d6

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