Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eedc58159a1758e…

MALICIOUS

PDF

74.2 KB Created: 2021-09-29 05:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1f3956f9ad5c9ab48d4f9051b158418a SHA-1: 4ef97ddf01c5427a6aaa64f72be35e2639e0dca6 SHA-256: 8eedc58159a1758e38411a12c039f19522a57b878d5727d532e9ab67c234390a
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 maliciousness. The presence of numerous embedded URLs, many of which are part of link farms on disposable hosting, strongly suggests a phishing or malware distribution campaign. 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 0.9976

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://coretry.ru/uplcv?utm_term=carmen+butuan+city PDF link annotation
    • http://petra-koparki.pl/Upload/file/18224069209.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/topodutatupuxivelu.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/91490982985.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/33061638488.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/fezenababitupufipik.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/vitiwige.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210901_232507.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/fudikomopesobesi.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/bidixolilazuwif.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/10006553827.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/2683b5d9d762050f8c1bd7f12a2ae97f/dawowenomidobovowon.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/97531036539.pdfIn PDF document text
    • http://cy2hand.com/userfiles/36910340466.pdfIn PDF document text
    • http://hongdacable.com/d/files/fuvoneremajusifi.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/kakolulobajugulabira.pdfIn PDF document text
    • http://chinalabware.es/d/files/38181550240.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/78425809851.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/62627294562.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/68931225245.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/44212059112.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/30431653028.pdfIn PDF document text
    • https://sterlingsez.com/ckfinder/userfiles/files/46156445314.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613040d71beb4---18784445387.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_off0000b6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F6 19960 bytes
SHA-256: 85078a1be44aff50a292752bbbcfa61900a47f5087b601aba8679a4f9fb4a2be
font_01_sfnt_off0000eb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB72 10444 bytes
SHA-256: 27fd504747666005cf4d53d02ae31ca535df7254eabad2dc6de762125581ac28
font_02_sfnt_off0001032b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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