Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e46d93da638c738…

MALICIOUS

PDF

81.0 KB Created: 2021-09-14 02:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a71f8fc112aad270e39144280c943339 SHA-1: 7086991caba4b48953a8d33e21d46b5169a7b03b SHA-256: 8e46d93da638c738a1ed03d14c5303d78d4806734871bd8c43d28d3f78a1b428
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://polaryachts.com/res/wysiwyg/file/69156272596.pdf In PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/makoxikurureduz.pdfIn PDF document text
    • http://nprofit.hk/userfiles/zotawisuwu.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/26911371824.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/27994473615.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/38131590139.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b05bef14---13344983614.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/40757046498.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/pudunedazabosi.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/masosevu.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161330f57edbdd---64415943732.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/18444008177.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/53645857331.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/fovaxitiwizekiti.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/safapibuvijetowadi.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/kikoraluvizumid.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/pizaragalodi.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/gipakapukaviwote.pdfIn PDF document text
    • http://aimic.com/userfiles/file/85155963056.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210905_213600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+connect+mobile+internet+to+desktop+pc+with+usb+cablePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000d428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD428 18760 bytes
SHA-256: a2dacc6d3f6f90a40c50c65d935c69bd40b3096ac20143db782c4da4d5633a81
font_01_sfnt_off000104b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B2 11188 bytes
SHA-256: 3e3901282d3eefa5cc824adfe858acfe2ccec310d854f98e717d1eba3b9ba88a
font_02_sfnt_off00011e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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