Malicious PDF — malware analysis report

Static analysis result for SHA-256 118d6e2717d883c4…

MALICIOUS

PDF

79.1 KB Created: 2021-09-19 07:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa3d5c5acaaef38f13a7ea02da4db308 SHA-1: 328e5c5ef6b5f7380410b861ccec702066b5a77f SHA-256: 118d6e2717d883c4292d0d752cb8ed79e6a187428afd44454408c733eeb8a86e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

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.
  • 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://crysiq.ru/uplcv?utm_term=video+editor+for+smartphone PDF link annotation
    • http://xahscw.com/userfiles/file/19581721445.pdfIn PDF document text
    • http://demkapi.com/resimler/files/sawofekewopugam.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/31686661992.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/56500927614.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/98228717517.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/filobepevimope.pdfIn PDF document text
    • http://gysanya.com/upload/file/210917160351572675cwz8pn5sybf3.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/ratudimixuneletujiripaku.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/safakuwu.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/28564931457.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/kelibada.pdfIn PDF document text
    • https://buyafranchise.org/files/files/vajavojerisenetovuvutu.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161469ded65c8e---jotatigufadezusi.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614077f7483bc---guwagunir.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/200892646961452ba03e58e.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/44483189446.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210919063828.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/suvise.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/7304231351.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/fepawatevubevi.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/7187913283.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/30549129928.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_off0000d3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC15 10688 bytes
SHA-256: 805d2d4bf0041975c871e48f5bf6611992236e07587f152b23e1179421d442c8
font_02_sfnt_off00010464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10464 16568 bytes
SHA-256: e6d8c126629c41ef391937644320c09929a7a3cd49172961a3a01b76767f0015

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