Malicious PDF — malware analysis report

Static analysis result for SHA-256 16dcd1268e4d2def…

MALICIOUS

PDF

83.0 KB Created: 2021-09-08 17:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9b8d7286eb2dd9e0edf0b6be636636bf SHA-1: cabee1c8b5e49ee9e6ed58e8f2f221b068b1b795 SHA-256: 16dcd1268e4d2def21792a2f1605708a8c7a394d973f09b3889a2509e82899f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs disguised as search results, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://unibeauty.com.br/ckfinder/userfiles/files/48906214490.pdf In PDF document text
    • http://fundacjahfg.pl/upload/file/86617789582.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/posufopemefapuzarif.pdfIn PDF document text
    • http://blueyee.com/upload/file/051848041622.pdfIn PDF document text
    • https://tigaintan.com/contents/files/megilon.pdfIn PDF document text
    • http://yoron.net/up/files/kemuwuwujegimelu.pdfIn PDF document text
    • http://sro52.ru/uploads/files/sinatit.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/27945502643.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/dadifizagosawaz.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/mifexinitubulo.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/gesuvuviragisimet.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/fivaritusuwi.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/ed577d1aac16dc069090ce3f8c866c6e/82341962227.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/14594258441.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/42491681912.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/ronamitogesulovaxijaxexe.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/71140549665.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307dfb6b520---moxaradevuxigagozigazaj.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/64933935356.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/dapivoluravezo.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/85351201550.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/48018835888.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/mugitizitilewefuluviforig.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210903_6E077AFE37272156.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/detupaburup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=harry+potter+quidditch+through+the+ages+pdf+free+downloadPDF 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_off0000ddfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFD 17412 bytes
SHA-256: d5eacab6e9f08a66019f6df3368233267395f8ea7106d729d3b79c10de242ee1
font_01_sfnt_off00010b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B79 11336 bytes
SHA-256: 46dc1a25e6cb18cbff0891a45dbb3d3fe993752714918a8c1b80872fb59d4a1f
font_02_sfnt_off0001259c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1