Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed832f0a209a30e…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 00:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0bf8aa290f4cc020e09d9cb675e65558 SHA-1: a0d3ec1443ac51baf58ac8d1bb7ecd33edaa646b SHA-256: 8ed832f0a209a30e633121e3820ee1ef232c1c68d75e80ef0c1b8a16c178e0aa
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and exhibits characteristics of a phishing lure, including a large number of external links to disposable domains. The embedded JavaScript stream suggests potential for further malicious actions, such as downloading additional payloads or redirecting the user to malicious sites. The numerous URLs point to a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4339

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 https://synerhu.ru/uplcv?utm_term=redmi+note+8+next+update PDF link annotation
    • http://akvatoria.by/UserFiles/files/86096386553.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/e62f51296bfa3464a0be2a7787d39bc8/19187479767.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/78309558254.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210902165503_7fsg1n.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/82511633565.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/3159953518.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/84723113341.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/33864644977.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/pupuje.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/jetavosi.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/87995474804.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/zekepumuj.pdfIn PDF document text
    • http://tecksco.com/upload/files/wibogiwubemenuk.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/92981130170.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/wepubafelujapivika.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/xozux.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/lenuxugizawibaji.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161450357c11d9---67661769384.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/luvevujubiz.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/32079227616.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/46368622552.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11288766910.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/56770537862.pdfIn PDF document text
    • https://casartigianiudine.busletter.it/ckfinder/userfiles/files/32098911745.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/45228742967.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/17010692291.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F5 17716 bytes
SHA-256: e923e19a6b8640b6fbae8bf0f5286c8da101c28c572872eeff4a9aa1fd89314e
font_01_sfnt_off00010e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12680 10692 bytes
SHA-256: 5777395ebbb3dca0df5aa94165c72b08e7c9b9d84b1c292109bd79a6144e78e2

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