Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e5374f073442552…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 15:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3e6f30949a0825821b98f33e8cf705bb SHA-1: 9eab542485c23a9e9778b44cfc104cdfcb33acc4 SHA-256: 0e5374f073442552f5da8ed9be08b95569cb810af4fbd31f9120acd789ed2950
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm on disposable hosting, likely to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://synerhu.ru/uplcv?utm_term=jester+arcana+persona+4 PDF link annotation
    • https://0922.sproname.com/files/userfiles/files/31592674875.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/7029469980.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/79866663224.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/26383620439.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/37534342502.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zifufumukuri.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210917201759.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/sogawaxav.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/18853202960.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613586fc92bb3---28988115018.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/movujofisetawukiraxi.pdfIn PDF document text
    • http://air-con.ru/upload/files/96666411637.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/kexoreninopato.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/25913962865.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090310295930.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/89072875861.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/kojezeda.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/fumimiva.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/90823496709.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/wowozobadorogotepapogal.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136d7619f2a0---36737564200.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/93900923108.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/69765293154.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/nenatemuj.pdfIn PDF document text
    • 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_off0000d810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF027 10296 bytes
SHA-256: 3306d3aa4b27af34b1200776bf14de5c15b24c1af604c561ca3b400f32958150
font_02_sfnt_off0001078b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 17788 bytes
SHA-256: 823b14cc9907bb727f654b4665b3b454809e074604ad726a0c3c5e2dc7248ea8