Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f7b14a1ee71ff16…

MALICIOUS

PDF

95.7 KB Created: 2021-09-11 23:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e7ae95cc9d11ecc3da9ba89102e78c82 SHA-1: 71c413188bf3871c1e04cfb283c82d0b647a9de4 SHA-256: 6f7b14a1ee71ff160d5fae40a1cb4c1e15eb847e440fa48102e8fed9ec3db6f5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to PDF files on potentially disposable hosting, suggests a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://buildingexpertsdirectory.com/ckfinder/userfiles/files/mofobuxumupibewiw.pdf In PDF document text
    • http://rassadaspb.com/new/files/file/84279026221.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/fijuketogixubetowakukem.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/mapasekefeponozon.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/54640138524.pdfIn PDF document text
    • http://jadeite.ru/images/file/34514879890.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/zebak.pdfIn PDF document text
    • http://osayit.com/images/file/65902935082.pdfIn PDF document text
    • http://montazenabytkupraha.cz/files/file/63331737540.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/78305404095.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/48850644686.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/1968916919.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/82574120359.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/e25005208f771916721f3802121a83f9/89868923841.pdfIn PDF document text
    • http://ebus.cn/up_file/file/67632805896.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/14749677845.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a36487ce59---90412489877.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/losazujajegenewifis.pdfIn PDF document text
    • http://naso10.com/userData/board/file/topokekosafuzipules.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/tovuropim.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/47176137242.pdfIn PDF document text
    • http://elsped.hu/files/file/kudelatamibubugokeketis.pdfIn PDF document text
    • http://sksound.com/userfiles/file/tutekexefisixefaxemebejun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=los+juegos+mas+chidos+para+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_off00010caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAA 11004 bytes
SHA-256: 3d6b6d6a3e5ac393439b94eca85f46bd976ac8ad72780d78bce10a5f478a073b
font_01_sfnt_off000125c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C9 20216 bytes
SHA-256: c8226b344d78009e1256f5f3fba43c2328da426a1bf290eaa84eb6315d9285f8
font_02_sfnt_off00015912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15912 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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