Malicious PDF — malware analysis report

Static analysis result for SHA-256 45ed640057312bd2…

MALICIOUS

PDF

73.4 KB Created: 2021-09-25 14:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 70baee4e3ff6298b9780254df5a52172 SHA-1: 789b9a7185b3c44d631e4cff25bf24bbab39bdcf SHA-256: 45ed640057312bd25b09a85814bb8111fdf22dc307ad6b97b141d29387efc402
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The PDF contains a large number of external URLs, many of which appear to be part of a link farm designed to obscure the ultimate destination. The presence of these URLs and the overall detection profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://queure.ru/uplcv?utm_term=how+to+transfer+files+from+phone+to+laptop+without+cable PDF link annotation
    • https://asken.as/bilder/file/meloxodawumabewizoregojop.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/65659481835.pdfIn PDF document text
    • http://hawaii-resort.info/images/blog/file/kaxozosovabinusavudepik.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/27691874149.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/purupipejujaderuzupopexix.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/legenumizivavumuli.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/93045733521.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/xazuxigaxujabefofokotav.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/90700861501.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/95444211682.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/wimuzivinas.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/lizesuriw.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/88786119029.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/97415921751.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/jukizajoro.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/94587202940.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9a7bc2c52---wufitelude.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/2674aaf5f6679e7089c74acc4c0810c0/72982086415.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/divepomipiwafijivibowusaz.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/jasolozovon.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_off0000b518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2F 11064 bytes
SHA-256: 2721c30328621c57409f09dfb0eaea3217ab6fa54ddb9e431310b9057ca4d39c
font_02_sfnt_off0000e689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE689 19236 bytes
SHA-256: 7ad24ba9b82ec129d199ac7c7d0e1643931ec24cec388480ad4e4d55c4e37f46

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