Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e7137a9c692b31b…

MALICIOUS

PDF

77.6 KB Created: 2021-09-09 16:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 65d33ec68a454dd3ecb93c32675b99dc SHA-1: 0d1b5b38c0ec48693d3f195e35c0be094297045a SHA-256: 3e7137a9c692b31bde4c45edea1d03e60d9806dfa4a52cb17b7c3955ecc9c7a8
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external links, many of which point to potentially disposable hosting, suggesting a link farm used for redirection. The ClamAV detection and heuristic firings indicate this is likely a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4417

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://studiocastigli.eu/userfiles/files/dovetixomijomuzafalu.pdf In PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/53051918565.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/fogaxezasisemilitufa.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109012123072647.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/65400682320.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/86594625412.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/zevenipitagitisaxiwupap.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131643e5be5a.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/32300878950.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/87342439758.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/novipofek.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/rasisitidalibolonux.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210907_073207_4549.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/volegadomax.pdfIn PDF document text
    • http://carszana.com/image/upload/File/45135123489.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/fatenemafiwemo.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/21059328631.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/tegilev.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/34854574816.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/vibasimibelo.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/64909035665.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/70636061640.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/sipezivajo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309465ddaaa---pubotelotazi.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/17994367110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=words+with+o+sound+phonicsPDF link annotation
    • 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_off0000d8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F8 17820 bytes
SHA-256: cc67dfca50f6ce291c66aa60c98e482eb3c6e339ffade2947731e7afe97c70d5
font_02_sfnt_off00011f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1A 10448 bytes
SHA-256: f5873b57dcca3aaf07ade9792aad022ac09aafd9bd81cd63acd5663ce8527270

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