Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa6a39724c5f339…

MALICIOUS

PDF

63.6 KB Created: 2021-09-15 18:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c70cf5432d9c216bccc7eb32909ef6dc SHA-1: fe6d22d72c0b858e611c3447715fbcd31d956b82 SHA-256: 6aa6a39724c5f33933ee4b24cdf30e33c4637a8fe4b488bbcf842ee07fc47bbd
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF structure and heuristic firings indicate it's designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6298

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://indyskischool.com/ckfinder/userfiles/files/kokawike.pdf In PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/losetedujiwerigetanavobu.pdfIn PDF document text
    • http://cochemical.com/upload/files/20114126528.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/22876140968.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/xegulemojamimudesazenar.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/36595606596.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/31927147786.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/57542370402.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/guxedevomovubaxopefebumi.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/monemixavo.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137a0ac3fb84---metiwusifofutabasimamodof.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/bidawolotiwadoduka.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210913_6485BD3D8C00C243.pdfIn PDF document text
    • https://questyme.com/userfiles/file/95280657622.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/xoroj.pdfIn PDF document text
    • https://tch.lu/files/files/27296809736.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210911152034.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-11-08-55-08-88.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/hdbmq3kn0cc6ek7sqp7b6lgnu6/8267599249.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/tomexadisumew.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/zugimudapimidilemuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+not+print+background+color+in+pdfPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/najavunug.pdfIn PDF document text
    • 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_off0000af67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF67 15544 bytes
SHA-256: 172b8bd5e8ab7f8e2b28ef1a188f08986e28808ac103b772b2dedfdcafdb39c5
font_01_sfnt_off0000d6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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