Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce55e012c91fe10…

MALICIOUS

PDF

78.3 KB Created: 2021-09-17 08:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0897528e676243a99138331d4f33a469 SHA-1: de3255230ba5517edb35788bafbff542d49d3b0c SHA-256: 3ce55e012c91fe1027798a6587e2b9bfde739c4aa6e97a3ef4f517e66ff96b04
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains, suggests a phishing or link-farming operation. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://medvor.ru/uplcv?utm_term=watch+online+demon+slayer PDF link annotation
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/737fe04fb56f60fedcbabfd9b8b1cc32/8659851701.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/kiwabewava.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/zenozamanat.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/norewigudi.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/22488137391.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/tojobizoz.pdfIn PDF document text
    • http://husplaza.hu/editor_up/76111158360.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/95210511912.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/puwuwalofaw.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/61128704124.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/pevetakasabef.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210908185558.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c732b257c6---65475401317.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/61652305853.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/ranuroxekom.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/bosidekoxujub.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/47260188486.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/dunugapurazekoxi.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/6438246627.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/44867517003.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/gidewupukoxumesova.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/ludawal.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/luxikamob.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_off0000ce28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE28 17280 bytes
SHA-256: fa10cb2047e3ef3685be152a8102bd1740e16ee639b33fa99dacfd003f904bc7
font_01_sfnt_off0000fb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB46 10740 bytes
SHA-256: f1b57787cad071f5a72c25001720265cfad5b6bc7210e3fd7ba96114e3517323
font_02_sfnt_off000113cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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