Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc086a298d4924f…

MALICIOUS

PDF

71.1 KB Created: 2021-09-08 22:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f22e08267de8afb3fe7a1596afb07437 SHA-1: 5f00f9d3db30037134f833d84beea5960253b6d0 SHA-256: 5dc086a298d4924fa87667cc01cf16957531c9caeeeafe916d03f14397bd747d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, suggesting it functions as a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful websites, possibly for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/uplcv?utm_term=leaf+green+rom PDF link annotation
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613710d085ccb---wudisawow.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/70186239242.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/rakeziwukon.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/bexotumuvoza.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/fafut.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/dukofaja.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613833ba88557---sanirufafetix.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/16143084559.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/75262773322.pdfIn PDF document text
    • http://kaies.net/upfiles/210907220757536262i2jh78.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/46534786614.pdfIn PDF document text
    • https://partetesal.ir/data/file/73548396910.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/39012073493.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/konigufubaxiwagudasewa.pdfIn PDF document text
    • http://hcwan.com/userfiles/file/dotino.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/60566391387.pdfIn PDF document text
    • https://venus-forever.com/image/files/pafego.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/65209953842.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/zerisotumemigisoderud.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/92499733508.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/36408135048.pdfIn PDF document text
    • http://trovas.com/userimages/40265033237.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/20219754517254.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_off0000b620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB620 10108 bytes
SHA-256: 3c2575554941e250990047c72d283c2c8fb7912a1f55d534dcdf156ef83a892b
font_01_sfnt_off0000cc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9E 16620 bytes
SHA-256: efac04ab0264392a556af5406e97edba9676add4838d6938fa0c0b8b5a3ce208
font_02_sfnt_off0000f736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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