Malicious PDF — malware analysis report

Static analysis result for SHA-256 f49407df58f07315…

MALICIOUS

PDF

80.0 KB Created: 2021-09-21 09:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a7019922d5d1190499da86b7379d801 SHA-1: 85d9e4634b5462c6c1ef33d9e82ff157ab78885e SHA-256: f49407df58f07315af03518730cff0784c8ae322df94ca61f7201fbcdbe7ebcb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs suggest the document functions as a link farm, likely intended to redirect users to phishing sites or download further malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content to analyze.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://hightopeducation.com/cms_uploaded/file/39911133396.pdf In PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/70020345516.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/xomojeti.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210916_225919.pdfIn PDF document text
    • http://hingliltd.com/userfiles/vuxozopafolan.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/67818901938.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/34922622207.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/83920693603.pdfIn PDF document text
    • http://one9five.com/userfiles/files/suvisebivotetuba.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/girilidedakorepawoded.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/klbnpmgurqa3fab3nrlmq0bj3h/nukigegejovazuv.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/87844713036.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/ximilotigatatones.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149489961b15---21462097709.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/90422328508.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/rujugutobajaxisiwomasotar.pdfIn PDF document text
    • http://limoride.net/gallery/file/50490044922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=freestyle+basketball+apkPDF 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_off0000d5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F5 10252 bytes
SHA-256: 354eb2ea6c7546baf5961b8900fbcecf8d3498eee0f304f3d7b891e196dce8d9
font_01_sfnt_off0000ecfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001050f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050F 17612 bytes
SHA-256: 2694b4ee1a6a3c1ead819cc6cba7b3a87b548fd88cf197b10041b5ca5191af22

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