Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8d9b0bf46dba51…

MALICIOUS

PDF

78.6 KB Created: 2021-09-10 16:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1e20d8e7356d8de14a55fa84075ce0fd SHA-1: c229894a2eeb53d5d4df5097c84f555573bca97d SHA-256: 4e8d9b0bf46dba51f41921da3f868202e17b2dc56f77a6b958c486ce5f80ef13
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document impersonates a cloud file-sharing service, a common lure for phishing attacks. It contains numerous embedded URLs pointing to potentially malicious content, with one specifically noted as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download or redirection to a malicious payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://smidgel.ru/uplcv?utm_term=how+do+i+connect+my+phone+to+a+laptop PDF link annotation
    • https://atasuorganiktarim.com/upload/ckfinder/files/39279791952.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/muxinanizugojajuse.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/16702186158.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136f447df49f---24483002827.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/putemisolaxeliwigoxo.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/legisowasapikiniburubaje.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/pasuribuvinesi.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/39243646884.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090302532934.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/3647386555.pdfIn PDF document text
    • https://digicpictures.com/downloads/79181414509.pdfIn PDF document text
    • http://hkalc.com/userfiles/kegibemaliwonase.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/xekof.pdfIn PDF document text
    • http://screen.by/images/file/98449246062.pdfIn PDF document text
    • https://huanghecables.com/d/files/12427912154.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/6jl0b8ho823erm9d2f6igrj5j5/jinesunamizavibute.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/62539255088.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/88930368009.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///99216017801.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/bibugamaxowidazopewobemo.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/saruzepokepo.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/613942b3b0358.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_off0000d103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD103 16784 bytes
SHA-256: 08e148715ab7db8da3afcf1dbb5a924f8f9d0698e70feda659b3dbfbbf9b9859
font_01_sfnt_off0000fcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DA 10700 bytes
SHA-256: ec1aae4a2acaa62d457be6c368dfaa818997c871eb8c8d5e82cf43908c5546ca

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