Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb7643f50bf9b49…

MALICIOUS

PDF

75.4 KB Created: 2021-09-20 18:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 65113ee75b7deb2fd196fde5f2b6e155 SHA-1: d36ca06f58aaf17c7757c18c057f5fdf23752b6d SHA-256: fdb7643f50bf9b49fac63a6908d6faec94c0e9590e9ae7d33301b2ead23aa9ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, identified by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the embedded links suggests a common pattern for spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://otpetye.com/images/shared/file/weriwikazuvitagemasavebop.pdf In PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/netikubino.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/18564547976146cf40cde11.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210905055126_243025399.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/37757512930.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/32023694646.pdfIn PDF document text
    • https://satesayap.com/contents/files/xokotiwibusirisa.pdfIn PDF document text
    • http://rld-carbon.com/file/14146892647.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/xipigigozuwudineboje.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/wizalefidasaxu.pdfIn PDF document text
    • http://allasclub.com/campannas/file/sofiverusimiw.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/tibejejerowalajesim.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/87151323864.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/dalex.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/31080133750.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/44408630974.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/86866023216.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/54872286981.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161318102866b3---46558559341.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/lakize.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/gojufabuwinerisageva.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/64764584778.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/didilupowi.pdfIn PDF document text
    • http://rem-proekt.com/f/file/7676986239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=talking+tom+modPDF 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_off0000bd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD584 19784 bytes
SHA-256: 20d52b5a058383a4c24fdd8ad8a99df7139860920ac823f03ba44a54a85e9b80
font_02_sfnt_off00010970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10970 10244 bytes
SHA-256: 5668793597094b3d6abd27a1f10e3fd052e6f9939f5ec462a186163bf545460c

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