Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f24aa4199cc8c82…

MALICIOUS

PDF

67.4 KB Created: 2021-10-02 09:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0559f9d3206e9af6f91e7f95657576a1 SHA-1: 64d75ecc3cbef3fcd187deff129e4ef928d9f782 SHA-256: 9f24aa4199cc8c82428987e902c6ef685fda1290e8192637ecaed445d4ba4312
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 heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous external URLs suggest a phishing or spam campaign aiming to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=humour+in+the+classroom PDF link annotation
    • http://acevina.com/webroot/img/files/57128464203.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/bobinejevakexexotipek.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/lusaze.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149c873680d4---37459198782.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/genarufapewirafaretujudi.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/nelub.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/jelirul.pdfIn PDF document text
    • http://csp.hu/editor_up/xavozujazexerefimutefepot.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/63876871535.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/watazuzulamesatu.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/zexogawew.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613649e65770c---bubusetiwibexuvezanu.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/lopamitadubetugupu.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/63051390804.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021992042518623.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/gazanovi.pdfIn PDF document text
    • https://aildf.in/userfiles/file/zikebosizikaroje.pdfIn PDF document text
    • http://citra.cl/userfiles/file/40274765975.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/ruvizip.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/80349475176.pdfIn PDF document text
    • http://hejia-ele.net/upload/sitozapowupopovexeb.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/23288753467.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/gitilogu.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_off0000ad61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC578 10588 bytes
SHA-256: 8ec19a58eb8993decb26548d54972c3b4c6b59265eacf2e4f1d219f8bd4ddb88
font_02_sfnt_off0000dd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5B 14140 bytes
SHA-256: 914139aaa80fc9024946bf4ccd0f75c94af49f57d6115739dae49a2b86fca14e

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