Malicious PDF — malware analysis report

Static analysis result for SHA-256 09089397535e0c3c…

MALICIOUS

PDF

66.5 KB Created: 2021-09-26 11:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ddb1d41e3199af6b3db81473780bea9c SHA-1: 3f535e1d2a7d7ba7a206865ebc043ec93906b0bf SHA-256: 09089397535e0c3cee928f947bf0beae199d96d1bf3dfea501f05c8cf9e71e9b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to PDFs hosted on disposable domains, indicating a link farm designed to distribute malicious content. The PDF structure and numerous external links suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6057

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://thietbiantoanttk.com/uploads/files/fodijevef.pdf
    • http://dighakanchaninternational.com/FCKeditor/file/63177585585.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/92871366501.pdf
    • http://obras.ru/sites/default/files/uploads/lunatezaxubirajepivoved.pdf
    • http://dunajecbiala.pl/upload/File/votutujo.pdf
    • http://sallytour.com/FileData/ckfinder/files/20210901_306710C3C25570B7.pdf
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/35490088495.pdf
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/timog.pdf
    • https://southafricapools.com/contents/files/mazuga.pdf
    • http://thechitay.com/uploads/userfiles/file/65536289704.pdf
    • http://deauville.ru/files/file/jomonovugujemu.pdf
    • http://sineadstone.com/userfiles/file/85872228149.pdf
    • https://markyatirim.com/resimler/files/zokuzan.pdf
    • http://botosani.ro/img/uploads/file/pigesutevisirelozo.pdf
    • http://icmasistemas.com/userfiles/files/5809319274.pdf
    • http://innotack.com/userfiles/files/25521622368.pdf
    • http://zhizhencn.com/filespath/files/20210923164846.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e1dcadf7efaa38b370ae630d036dc7ab/79606013986.pdf
    • http://sicilalluminio.it/userfiles/files/52936049048.pdf
    • http://eurolocal.info/sites/default/files/images/file/balivuwozi.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/894dd9db1268a8891880ba5a25f1dbea/ferovaxewexinuturobosul.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pokemon+alpha+sapphire+extreme+randomizer
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000acd8.bin
0b3aa0e9d5902e5da78ab7e2d4b34b71865fa751528722699fcc162b7306d100		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACD8 16204 bytes
font_01_sfnt_off0000d625.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD625 16792 bytes
font_02_sfnt_off0000ee3c.bin
200920b545f334ad79f0dfb008368be012c0d53d6a7f3012ad3da69dd297aae1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 10912 bytes

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