Malicious PDF — malware analysis report

Static analysis result for SHA-256 e46badbb0bf0df0f…

MALICIOUS

PDF

78.3 KB Created: 2021-09-16 23:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e8a95e57181374b30e11c777f790d10d SHA-1: 58568b9930db531b99507b8c93c3361d5a158c78 SHA-256: e46badbb0bf0df0fc8943c099cc745b8ea3e12cb799a78e28c7ef59d7a793d4f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are structured as download links for other PDF files, suggesting a phishing or malware distribution scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of hosting many links on disposable domains, often used to obscure malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://huntic.ru/uplcv?utm_term=sky+games+apk PDF link annotation
    • http://laihoawedding.com/app/webroot/upload/files/bevenilatizovetokuxew.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/zikisabisakitodixedip.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/winaxar.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/43502843532.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/26854055574.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c30ae8c3e2---xalesofilonevibukudo.pdfIn PDF document text
    • http://uteambio.com/upload/files/newutuwabubinorop.pdfIn PDF document text
    • http://strandedtattoo.net/file/3556460580.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/51723233416.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///kekutigedagoja.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/dd01911e172e00103c0920c6e201abf1/22723438571.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/17404243507.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/53599424128.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/xupaj.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/17435473853.pdfIn PDF document text
    • https://flyags.com/editorResources/file///sewoza.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/bumimevu.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210909_82308A699C04AFFD.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/kebaladatafikexama.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/nirusabenefagozosikivo.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/67546757710.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/32934215887.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_off0000cfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC0 10316 bytes
SHA-256: 36d8c5b3843a943673688d39a7b66b8b206e8467f53aca4d12c4fda6c2901109
font_01_sfnt_off0000e710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE710 17520 bytes
SHA-256: d249724715d8cfe41c052b92564181c5fc767be6accd5d08e0e173351e8571aa
font_02_sfnt_off0001142a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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