Malicious PDF — malware analysis report

Static analysis result for SHA-256 156a3c6b896a44a0…

MALICIOUS

PDF

86.0 KB Created: 2021-09-13 20:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef13874c65a16fdf707b95b1078e4b77 SHA-1: b9584df52bad8c33f6734b6c0f6d30160199386d SHA-256: 156a3c6b896a44a040912b7f701f8056e5601779dbef0f4212b46c09c7cd7dc2
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 ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to external URLs, as evidenced by the numerous external URIs found, suggesting a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://daulte.com/ckfinder/userfiles/files/ziwux.pdf In PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/40365913399.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/jetudatutopunusuv.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/89318200503.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/41977162367.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/rekuw.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/tuwawarufab.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/jasowera.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/25495123683.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/mologetevidusumebaduzaxe.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/jelebaxetesuvepaf.pdfIn PDF document text
    • https://icbacademy.com/upload/files/dorabusowivadu.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/18328f89b970782a3fc4bf1dc5582de7/61696582724.pdfIn PDF document text
    • http://ceroki.com/image/files/duzukatovo.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/paduruvasikorukita.pdfIn PDF document text
    • http://022-web.cn/uploadfile/file/20210907180011441.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8d768f07e---98233514736.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/94332185377.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/zumuk.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-12/20210912185839248408.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/93555611660.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/pegilamaxoveralesat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=dvb+t+app+for+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_off0000ee04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 17432 bytes
SHA-256: 0a7464a18caa19bcba146988f92e9b959ef27ee4353b0c4138af4e07dead050e
font_01_sfnt_off00011b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13327 10352 bytes
SHA-256: 046eadae0e435a132d663d15b7a6eab3503e9777212c6cbe4b2df6793f027db6

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