Malicious PDF — malware analysis report

Static analysis result for SHA-256 f651ac3bed657cc6…

MALICIOUS

PDF

80.4 KB Created: 2021-09-12 18:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01b4e6ad45da8c91d9ed800246479c23 SHA-1: 4965bbc34be57f343406eb6914d4fd434038a8af SHA-256: f651ac3bed657cc6321db505897d5555aff22b8f4a8c8f5dcc9b9bf4a320a437
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document contains numerous links pointing to disposable hosting, likely to obscure malicious destinations. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://medicentrumnz.eu/medicentrum/files/file/roxolovokixurinawov.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/02d5bc0b9fabeacf4fff7a2a43085c27/74048912328.pdf
    • http://heathrowairporttaxi.website/userfiles/file/zadosewikotilo.pdf
    • http://vizit-k.net/uploads/editor/files/vopisexilujodumojaxan.pdf
    • https://bimstudioinc.com/media/files/kovobugijorupenunan.pdf
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kidakagibowikivoxi.pdf
    • http://elai.kz/upload/2021/09files/210907161844884191svkog.pdf
    • https://dongciao.com/uploads/files/202109010238373292.pdf
    • https://lrsdev.com/userfiles/file/jabov.pdf
    • http://belloverde.net/emailer/file/84287993449.pdf
    • http://we-women.de/default/files/uploads/file/wadudobajajexuv.pdf
    • http://eggtesting.com/admin/uploads/file/pimonanabusur.pdf
    • http://xn--9w3b11kh5l.com/ckupload/files/2388916781.pdf
    • https://villadelauca.com/userfiles/file/19250287641.pdf
    • http://korean-school.hu/hangul/userfiles/file/talebodewudemefiz.pdf
    • http://komodovo.ru/upload_picture/43730060405.pdf
    • http://www.morrisjones.co.uk/EditorImages/file/fopel.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/898605580c01aff9c2777ab4e007006b/mavujo.pdf
    • http://vasekurzy.cz/userfiles/file/keweluzuvijomokax.pdf
    • http://mintaialuminum.com/d/files/20334227372.pdf
    • http://solartgaleria.hu/images/file/goserasomizizifuban.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=torque+pro+pids
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d634.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD634 16792 bytes
font_01_sfnt_off0000ee4b.bin
1a2f5b63979b2420d58f7807490ed4d5466c2415bd41f724f9ee358a2198339c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 10184 bytes
font_02_sfnt_off000104ec.bin
e6480948aec20df1ebd58c0792d7e20ef8dc57829a4cf8824bbd5a5251ada825		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104EC 18088 bytes

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