Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e76f5f081c137b…

MALICIOUS

PDF

84.6 KB Created: 2021-09-22 21:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a614212ed0caa7eccd88076ca961859f SHA-1: 71d2f4366111fa2e98d52557ed88a0219a3a587e SHA-256: c0e76f5f081c137b7ca949a7fc91e30491102503aed2c8e2d009ed9abcd40fe2
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs, suggesting an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://bagstyle.uz/images/file/15928534403.pdf In PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/63978282888.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/mukovariletu.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143f86683752---ralebodapisadevizevevi.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/5673066933.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/66136877918.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/58447172300.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/27223963398.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/2345527581.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/pofewet.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/zuzixovo.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/11444038403.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/savemodokajema.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/42155361207.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/72110939899.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/21709028687.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/purubijoxusofitupokuvede.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/67233675851.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/072141219115.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/fatotes.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb8c1c3ee9---73325936548.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/sunalovapoguza.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/27082453401.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/7885750689.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/42495521748.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/51865851983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=get+free+cash+in+8+ball+poolPDF 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_off0000e590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE590 17552 bytes
SHA-256: 87a819b0b4d84d18372e898ab78380a44776621b56552ed438c8ea9e5d1950eb
font_01_sfnt_off0001134b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134B 10964 bytes
SHA-256: 3b4f684ed17433677f56d5de580705b4c0e1ec2709526c24eb1df23098352f28
font_02_sfnt_off00012c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1