Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33c554e4d72b98b…

MALICIOUS

PDF

87.0 KB Created: 2021-09-12 17:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9e1c52ef575ecc1309c96d8da6e5694d SHA-1: 10b19409340b8d40e3268f26f75e3e36b839d5b8 SHA-256: e33c554e4d72b98b29a63618001f3bd6ba944d6e1e9893eb6fa70d1bc92cb7aa
134 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 executing malicious code. It also contains numerous external URIs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6113a6492---werumuvaduzovulebapibosam.pdf In PDF document text
    • http://ddaengshop.com/ckupload/files/zopuxisivisevudiwi.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109080845062756.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/51803644657.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/81365770777.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/19693917403.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/37215088023.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/wadamazol.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/begukiwomikefutuvilixak.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/vukig.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/11225890271.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/worif.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///94205345694.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/13412414121.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/72052214386.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/53154445311.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314d49dc065---35483281867.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/vipovifazedodiduri.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/86420138324.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/86721390764.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=super+mario+3d+world+emulatorPDF 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_off0000ede0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE0 18492 bytes
SHA-256: fc412c8df29a31bb8bc35c6d071a0a748e8cb23d0e8c7ecc100906c54beb9c28
font_01_sfnt_off00011e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13672 10716 bytes
SHA-256: 63bedac26732f4fc9f97ee353234af8ee36b287bc0fe9e4534a01691e33109f2

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