Malicious PDF — malware analysis report

Static analysis result for SHA-256 24942412429872d9…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 23:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 108c377b5645c1fe6350e1c952d55a09 SHA-1: d348f62ea06bb93bb2978678da4146b7db9af098 SHA-256: 24942412429872d99756263b71cfc661bf86dfe433dcecf124f2eb03fe66e0b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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=little+women+book+pdf+download PDF link annotation
    • https://loonbedrijfschimmel.nl/userfiles/files/99872408503.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612edd27851cf---24320834440.pdfIn PDF document text
    • http://jadeite.ru/images/file/difadodumaloributa.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/maponi.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/57890664638.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/zoxalamebateru.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/gebofimakarimof.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/guwanodituzifodijal.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/46019931333.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/masamabax.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/fazoluzapuguvofiwi.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/zasuwodatesopubawod.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/45183247234.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/zikowobejetawizerus.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/digelurulofefi.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/fajugusevobejupasakujev.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/buzubudimujixutipawij.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/70217131300.pdfIn PDF document text
    • https://renewone.de/files/pefut.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/91226613569.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/32224950276.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/93474729922.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_off0000d130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD130 10664 bytes
SHA-256: 3a25a86310348a44ad8dec65ec9739f804648ea0f346c668fe77d3508e3adb3a
font_01_sfnt_off0000e966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE966 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10178 19380 bytes
SHA-256: 35f9566dea1636159efe60318b9f9c3e25426aec565dec0c97b7c12f91f7f02e

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