Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85112f4dbd7519e…

MALICIOUS

PDF

123.7 KB Created: 2021-10-18 15:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0f39c65eeb1c0bd3184eb78fae3f3ae0 SHA-1: d21503d7af07cce46a510548f3b3621fbfb9d7e7 SHA-256: f85112f4dbd7519e4f38d192c402a48ef62190b1679043c376f818fc141534d3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating embedded JavaScript and external URI redirection. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm on disposable hosting, likely to obscure the true destination. The embedded JavaScript is the primary mechanism for executing the malicious payload, likely redirecting to a phishing site or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://efuturesthai.com/uploads/file/tixuxexe.pdf In PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/64331190798.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615f56384e11d---kimirorojazebatidi.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/vivasejubugugitaxebakotug.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/vigirinaju.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/joxuzunavir.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/savixon.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/dokobi.pdfIn PDF document text
    • http://hisunnychem.com/upload/files/27264607805.pdfIn PDF document text
    • http://ginkgokatsugg.com/uploads/files/32786368458.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/86475471882.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/pubogederiken.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/xelorusujimikuk.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/46431252226.pdfIn PDF document text
    • http://www.bash.cl/media/file/sirajufi.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/83186247328.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///51535389827.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/pebewatizukelofolomu.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/15228953485.pdfIn PDF document text
    • http://grupophi.es/uploads/files/31942724881.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109230123576354.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/53486286930.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/57209337090.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/nkaoe5go2bqq2eqg0tre5ur2ag/lalerinumowilorapar.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/60036966780.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/5bhJmFgkeCE/uplcv?utm_term=list+of+social+work+theories+and+methods+pdfPDF 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_off00017b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B3A 11020 bytes
SHA-256: a0156d5c1fa33e822f2e858b1f0ca915951b59f505c05d24f7211064dc68844c
font_01_sfnt_off000194b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001accb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACCB 20028 bytes
SHA-256: db1605d5b86bed56a919946472398dea07cb0bc130ea01c778feb157effa852e