Malicious PDF — malware analysis report

Static analysis result for SHA-256 7362364dde9ca371…

MALICIOUS

PDF

71.3 KB Created: 2021-09-18 15:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5debf0f06d7d908d572f92a1cd4afe05 SHA-1: e4317b46880bedd7a177a5a34ea0ec54181da0f9 SHA-256: 7362364dde9ca371208667f0e9b2acf9b3b5f223bc2900b46e789561583d940a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to suspicious PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the document is part of a link farm, suggesting a potential SEO manipulation or content distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://cherriestattoo.com/ckfinder/userfiles/files/69742608869.pdf
    • https://makiriaszto.hu/ckfinder/userfiles/files/25600185849.pdf
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/rusozaperovape.pdf
    • https://escaletravel.com/userfiles/files/xebogamefe.pdf
    • http://greenflameenergy.com/userfiles/file/66272771550.pdf
    • http://akademibt.com/resimler/files/51062467010.pdf
    • http://seowonbattery.com/files/fckeditor/file/82047250461317ccb66b50.pdf
    • https://marwaservicecenter.com/nbloom/fckuploads/file/ditelurizimozeve.pdf
    • https://brillimet.com/uploads/files/202109032059072088.pdf
    • https://vandolderskb.com/images/usr/89253985796.pdf
    • http://rasmesafar.net/basefile/basefiles/44871653190.pdf
    • https://sportsht.com/userfiles/file/58888223721.pdf
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/17837537519.pdf
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/ruridak.pdf
    • http://kingkady.cn/uploadfile/files/xasobenejotafosofogaf.pdf
    • https://yodishit.com/uploads/userfiles/file/rafunobexalakaganololi.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613da65c35439---pokatolobigizita.pdf
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/puxemelitopawamimonug.pdf
    • http://xnucleus.com/members/member_images/files/942936489.pdf
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bugarutupuze.pdf
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/64921559710.pdf
    • http://supermarketdv.ru/files/file/javerapemizixozo.pdf
    • http://poltinik.ru/userfiles/file/pegowamolefezoruno.pdf
    • https://kermanrooz.com/img/files/91990937240.pdf
    • https://internationalmedia.com/userfiles/file/govipas.pdf
    • http://citygclub.com/ckupload/files/51549127447.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=four+resources+model+literacy
    • 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_off0000b676.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB676 16792 bytes
font_01_sfnt_off0000ce88.bin
e8c0504da1b510497d7c84cb8deb3cf5f14952a555222fd41e1bb1e97a41bcea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE88 16108 bytes
font_02_sfnt_off0000f6c1.bin
85bbd89b26055c928667450384ddc31fc2c86b6095e5bc8de3a2fb19896a4f01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C1 10620 bytes

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