Malicious PDF — malware analysis report

Static analysis result for SHA-256 68c07dcfe860e0ea…

MALICIOUS

PDF

71.3 KB Created: 2021-09-29 04:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9afc0707a4e3360944a2b44fc631e396 SHA-1: b996e958c8e31df7906f83bc35d722b44eb8a5fa SHA-256: 68c07dcfe860e0eaaf5977abbb8820c20a9912304d0c4ad096a76d9e8fef3608
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=kick+boxing+mod+apk
    • http://syarmarka.ru/userfiles/files/5827683300.pdf
    • https://christschoolblr.in/userfiles/file/vokowapojikusozabut.pdf
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78552379158.pdf
    • http://capital96.com/userfiles/file/70798153519.pdf
    • http://www.iciparis.ru/ckfinder/userfiles/files/xiponom.pdf
    • http://cyuansheng.com/userfiles/file/30307922895.pdf
    • https://jerseyshorepirates.com/userfiles/files/25717092796.pdf
    • http://qianxish.com/ckfind_image/files/puwasomu.pdf
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/gujumumavozezo.pdf
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/96814639907.pdf
    • https://kfk-dekoration.dk/images/uploadedimages/file/69302592165.pdf
    • http://vietsaovang.com/uploads/userfiles/file/buwaferagamapuwasepex.pdf
    • http://rentaruedas.com/files/others/xetaguwapepega.pdf
    • http://www.serenissimaservizi.com/files/vafujitikugonejojemekere.pdf
    • https://dalba.net/other_files/File/bufurepikowaluji.pdf
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/15174192749.pdf
    • https://hankilfood.com/upfile/files/60446538224.pdf
    • http://stroykap.com/application/views/stroykap/userfiles/file/12376477967.pdf
    • http://bestbelly.org/content/files/files/zemuf.pdf
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/legosifenanolakababen.pdf
    • http://www.heksan.com.pl/file/voridufaritaminukiba.pdf
    • http://almar-bus.pl/userfiles/file/xofimenumawelereg.pdf
    • 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_off0000afa1.bin
090921149af395406fd93ca2d846b95bfcdc20f64a10aa07323757649b39dd3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA1 18612 bytes
font_01_sfnt_off0000e01d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE01D 16792 bytes
font_02_sfnt_off0000f834.bin
ec9f2e83ede1bb984f3e2042b1ff2253d0e03e9377a55f27073d7a17b32ef7af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF834 10636 bytes

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