Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd64c43dc974b8e…

MALICIOUS

PDF

70.4 KB Created: 2021-09-26 17:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 800fe3af25e315923e1c608311fff1d1 SHA-1: bd1cd02b0301bb26676ee06fd4ed66ac7a117c3f SHA-256: ffd64c43dc974b8e465857128ab582c8393014c8dd9fd161852931569f31749d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates this is likely a link farm, potentially for SEO manipulation or to distribute further malicious content. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://ksboutlet.com/file/files/viwelikuleromufa.pdf In PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/litawuteverivilona.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27432399366.pdfIn PDF document text
    • http://dasbluemchen.com/77638055948.pdfIn PDF document text
    • http://sapthagireesyathra.srikarpagavinayagamills.com/userfiles/file/suvibukubereketakiwe.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/71362251637.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/faretozajevu.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/96514801055.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/fumevuxirumafesobivapaga.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/tubeludasugada.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/27334254819.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/782115948745d27566549aaa3eaac21c/kojejimawibadujixij.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/13808465226.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/35311089916.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/89023040130.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/tuwovogabugiledumuwegi.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16135eb828dcd6---gopivoxomopazuvi.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/pofutopixofuf.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/rufegona.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/49931924842.pdfIn PDF document text
    • https://www.nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/98071344787.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/56656503353.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/11136fc61056ffa3734cae8da453110d/46515374296.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/kikezu.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/7607201115.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/rezukefanebipuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=venom+devolos+qr+codePDF 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_off0000b49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB49E 10360 bytes
SHA-256: 70c12d85011c8902eb0df14663c77e0ef2b4945c8fec9d78e53e3e81a3e7d6cf
font_01_sfnt_off0000cbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E0 15728 bytes
SHA-256: 1bb2eb440dcb43dbf386d9023b465baf3804614d98faf5895d9cd8774ee51725