Malicious PDF — malware analysis report

Static analysis result for SHA-256 c49921f33a90dc0d…

MALICIOUS

PDF

72.7 KB Created: 2021-09-26 02:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 912f09a5121cf6f16763245ef2756854 SHA-1: 1b523687a3dbe2d233ecf3bcb20309516f4dff18 SHA-256: c49921f33a90dc0d384546a1aa46e6d4df1ff1e768a2b2a90d257288b721d06d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many pointing to disposable or unknown domains, characteristic of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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 https://leavereview.com/customerinterview/ckfinder/userfiles/files/86921688363.pdf In PDF document text
    • http://first-group.kr/ckupload/files/61605958865.pdfIn PDF document text
    • http://hocomesun.com/upload/wozususokeloribor.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210902_121734.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/18273443986.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/65520965039.pdfIn PDF document text
    • http://full814.com/upload/files/sonijawajurazozaxixonone.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/94493349023.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/fusabaxotubinofulasif.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/4711599292.pdfIn PDF document text
    • http://imbirimbir.ru/files/vevudegibewosaxabar.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/bc7a6d7f97375335ffdde9fe349dae3a/22245895508.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/81469970391.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109021957232198.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/49627654050.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/baluxizix.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/pubuzeluvokuwomedukofonil.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/vaxilusijuw.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f92e4bcb22---97269109127.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/27457235324.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/4675225993.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/52864098742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=shadow+fight+2+99+max+level+mod+apk+downloadPDF 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_off0000b1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E3 18064 bytes
SHA-256: a7842f2c149af310e629e92d58606a3dc5832b06290c1b1dd1bbf0e985b9251a
font_02_sfnt_off0000f8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C2 11388 bytes
SHA-256: f4c71dff8a40464cbec890ff73167947e0ea763735f5313ea70131f2736dcf3f

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