Malicious PDF — malware analysis report

Static analysis result for SHA-256 0261ab8b663686ce…

MALICIOUS

PDF

68.8 KB Created: 2021-09-20 19:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b442a2f507bea0b9d9d315e0a388d21a SHA-1: f0de408b705a3023cca935bbf1d4ca67bf4b4db5 SHA-256: 0261ab8b663686cea0e8220c419e47e26218b17509a341c78f2f7e97f82864f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, suggesting a phishing or spam campaign. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection as a phishing trojan strongly suggest an intent to redirect users to a malicious site.

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 http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c9e912d25---89605499839.pdf In PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/66990097058.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/16426033342.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/84945418380.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/tejikafobijo.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/vurifuvagibuzegeloworidop.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/3101910272.pdfIn PDF document text
    • https://videoeffect.ir/data/file/bawejet.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/32892057014.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/nawuvukix.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/50140394755.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/28152554786.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f8fa9f1ee74277c1f0c79022b0dd069b/72816313179.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/natemopab.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/duxotedajefi.pdfIn PDF document text
    • http://altinay-law.com/images/file/88623885864.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/nemuvabasorozas.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/xozid.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/kaxepuwasipozanidobam.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/fuvomupavo.pdfIn PDF document text
    • http://cortabellanews.com/userimages/ribemopixidifawifetowi.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/96596167476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=chrome+cast+mobilePDF 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_off0000ae34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE34 10560 bytes
SHA-256: 00f9c336a5c95c997e549496f4445088e67093596fdc8899b8b5e707c36b0798
font_01_sfnt_off0000c655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC655 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE67 15552 bytes
SHA-256: aeb443d97556ea2d23581c1834cd9a271404d224a9ab0e78fa81a6c47dd5eb5d

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