Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ee1a62cf82655b0…

MALICIOUS

PDF

69.9 KB Created: 2021-10-02 10:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc97c23c64a4e8a28eeb79940fb651f8 SHA-1: a083fd2d799e3de0b10e1461b3a1ab2b50a75791 SHA-256: 3ee1a62cf82655b0da8cda7eae25926926266ac3b06d0f00d28989b176cca976
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 for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many on disposable hosting and configured as a link farm, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=fifty+shades+of+grey+movie+streaming PDF link annotation
    • http://madmojo.com/fckupload/file/81856703651.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/kadorapakiseki.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/29443341875.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/vamowazekopejupofobu.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/97875954479.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/fukolozazezawu.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/nugugaseb.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/8703054956.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/4209656189.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/63027931473.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/28037907378.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/24577344280.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/4534946557.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/86874176466.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210909025835.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/numixarefakasaze.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/35206154568.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/javefoxojaweg.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/161492540d3c16---51926130827.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/46837701959.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/59282606931.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/wuviroro.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_off0000aec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DD 10912 bytes
SHA-256: c7ef035f79813f1bb97c6f3f77d303956d34ee342abf023f4ea19e18306a7002
font_02_sfnt_off0000dfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC3 16476 bytes
SHA-256: 37ce39d7ca2e4ae755dbb88d004a962fbe8c7672fab14c1cded59b8a390b4297

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