Malicious PDF — malware analysis report

Static analysis result for SHA-256 203763de3dfec0aa…

MALICIOUS

PDF

79.0 KB Created: 2021-09-08 20:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfacc51cffa1b13e000650b7c1450237 SHA-1: 5ca0cc5b08181dabbd3f8ea94cc639103c4e0211 SHA-256: 203763de3dfec0aa9064a7ffa1b2f3d9c3641b915b17a50e7fe6099ba90f481a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser or PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7970

Heuristics 6

  • 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
  • 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://sartoriaventurini.com/userfiles/files/zawowenavo.pdf
    • http://podiummoda.ru/userfiles/file/58781473639.pdf
    • http://iact2001.com/userData/board/file/24913123915.pdf
    • https://basisangka.com/contents/files/69824803555.pdf
    • http://romanakladatelstvi.cz/userfiles/file/janigukibewames.pdf
    • https://threadworx.com/thread/admin/uploads/file/xijurewexozorejaker.pdf
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/70454257404.pdf
    • https://stephankeppel.com/userfiles/file/vafididijonukemuzebebekub.pdf
    • https://a-guskov.ru/uploads/files/pezigomatomotiwozigiso.pdf
    • http://konditsionery-reutov.ru/upload_picture/file/dadatis.pdf
    • http://ordineveterinarireggioemilia.it/userfiles/files/32167932408.pdf
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/nudapitanipevovupowomud.pdf
    • https://codefon.hu/js/ckfinder/userfiles/files/48133625717.pdf
    • http://ghinelliarchitettura.it/userfiles/files/fujanekuvukederufibaril.pdf
    • https://cplastik.com/data/cms/file/wutobusad.pdf
    • http://nt-module.ru/ckfinder/userfiles/files/fawevewusajigekenop.pdf
    • http://thietkewebbacninh.com/webroot/img/files/62075461040.pdf
    • http://westhollywood.ilovepokebar.com/uploads/files/42646585893.pdf
    • http://edallyshop.com/upload/files/fegokekavopekegilo.pdf
    • http://huemin.com/fckeditor/userfiles/file/25970110116.pdf
    • http://kedehg.com/ckfinder/userfiles/files/kusujafekaril.pdf
    • http://dealershop.es/camarasegovia/userfiles/file/45459224159.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=safety+topic+manual+handling
    • 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_off0000db07.bin
6e3020bcb01a53f845c2c58d0ed40719d0bdee7f3d8c2cff9ffd6245e5f7052d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB07 11088 bytes
font_01_sfnt_off0000f47a.bin
e5a8cd31bbe3cf643b2900844802e739fcf2a655867bb6bb3f8d55c6a0f48e23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 17716 bytes
font_02_sfnt_off00012226.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12226 16792 bytes

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