Malicious PDF — malware analysis report

Static analysis result for SHA-256 38bf2c6e02ca5183…

MALICIOUS

PDF

68.1 KB Created: 2021-10-01 08:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2619b99a713a07c3fff77112d0a800c5 SHA-1: d2d6ccd3b3abaa99e3800be8b36d430ffcaec830 SHA-256: 38bf2c6e02ca5183079abd49e205a5a01509ede647bcc57a717d6710f8396f30
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm with numerous external URIs, suggesting it's designed to redirect users to malicious content or facilitate further infection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141188e3d886---26304827468.pdf In PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/kewefefipofomijaririzisux.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/62950468060.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/6198545904.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/8583ccj9c01c9ao27nevrts339/35613995442.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/15205942582.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/47246767285.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/gexonepile.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210928_33DF7971012C11EB.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/90838748162.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/99183710840.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/pigajogajasorigibemura.pdfIn PDF document text
    • http://tobolsk.fluentrussia.ru/img/content/files/zivaji.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/51135677300.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/62061239018.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/pizizujupuxelefupo.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/zuxarekisibukixedak.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/pasugitefinudawoned.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/36790708001.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/10228389582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=tekken+7+for+ppsspp+free+downloadPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/kagijonaxiwuxudewe.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_off0000ac46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC46 15168 bytes
SHA-256: 63dd59b09dacc09ee264fc813b2a1117aed1a74ef051ed6a0932eba43d875ee5
font_01_sfnt_off0000d2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D1 10492 bytes
SHA-256: 43681021d43f0681c7886443c68e38d19194ab5a89a457625923f0c60d142b81
font_02_sfnt_off0000eaf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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