Malicious PDF — malware analysis report

Static analysis result for SHA-256 3419d1fe3fbaa44f…

MALICIOUS

PDF

90.3 KB Created: 2021-09-16 16:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f3284f223b8ed879ba2926965d3a866c SHA-1: 22899cad2f84ee8f8d74255b493406dbcbde7206 SHA-256: 3419d1fe3fbaa44f43c55ec5ea2b9e65271b775388522e5773d38cb566ff868d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users. While no scripts were explicitly extracted, the nature of the URLs and the ML classification indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://alpinedelhi.com/userfiles/files/jawavinopuba.pdf In PDF document text
    • http://holidayservicemarsala.it/userfiles/files/97426805945.pdfIn PDF document text
    • http://chemicalengineers.ie/images/58817934783.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/45926540983.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/rapobunomexaputimapos.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/81067736545.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/86845387631.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/15593386222.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/62990688719.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16131da3e869ce---jawujutivonapanefogaj.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/vokoloxupozom.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/rexuputemarokabejezevo.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/xujebilimijagij.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/467684409.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/tokagodipatobime.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/veranedegezakakamukuze.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/71320726599.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/pibozobodubidunobuvomukaf.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/tikebebuved.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/80823302235.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/49357582802.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/jutumovekekevov.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/974264567.pdfIn PDF document text
    • http://sun-tes.ru/files/file/mazerebe.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///wufororozidomozewo.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e57289ddac---majafojodi.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/xemabideniso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=real+casino+online+androidPDF 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_off0000fc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC42 10308 bytes
SHA-256: ce3ae584f6177d491d83f596e4cb7bc864ce7495cf7cd6cc7d6db3b96c758c88
font_01_sfnt_off00011389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9B 18432 bytes
SHA-256: cddcc2d68f68bf1913a8f0a3c65e43bafcf3a009e7a0d15f41f7fa4c4ed304c3