Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd4e81c8a642b37…

MALICIOUS

PDF

83.1 KB Created: 2021-09-13 10:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 50695c1e4a62df93bd7df8ec033b236e SHA-1: 29a8acb2b99b7747904b416777b4cde6f6bcccea SHA-256: edd4e81c8a642b375facd8b021ee9916e894f343b1a9f40b686e58edc2cdc1a9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, suggesting a link farm or redirection mechanism. The presence of JavaScript points to T1059.007, and the overall nature of the PDF suggests it was likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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://marcobernini.it/userfiles/files/xarifovej.pdf In PDF document text
    • http://sanyosushiglendora.com/uploads/files/11804081935.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/939d24477af74656cface0e1eb6ab1a6.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/13255968471.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/pezovisig.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/8225812305.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/84405332866.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/99551437544.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/52667025368.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/90244518110.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fd36d082f---tatuxirekon.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/37140469705.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210912_175602_119.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/3382cbb2e4c9d179439397e2f2ee4654/zamiluzolovopakaxijunetan.pdfIn PDF document text
    • https://manenshop.com/upload/files/gobuvugiwawijigexejujugaw.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/64523992124.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/92744736702.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/dukixuzigimavikaralew.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/pigurod.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/wibijemuwudonuza.pdfIn PDF document text
    • http://videocycling.info/files/file/bazogun.pdfIn PDF document text
    • http://ergakiland.ru/files/files/zerosobenejizupida.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/pobotelidaxali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=game+turbo+xiaomi+latest+versionPDF 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_off0000e1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CF 17288 bytes
SHA-256: 62f9fe426706e94286b8c0cca8b4cb46533554bf6c7885e8a8be1e6c9424abb0
font_01_sfnt_off00010e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E79 10716 bytes
SHA-256: e59ea53233348ba96611aa7fa6733e8b40b7875adfe37fbf1bc8c2234b99c879
font_02_sfnt_off00012723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12723 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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