Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32af61a8224c6fc…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 07:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 115983a1c828438892831b28cbb4bb6d SHA-1: bcfd44e55a9aff224982dfea3a0b53c86d27df10 SHA-256: c32af61a8224c6fc9216d79ee0a2adbdec036a266d6c55bacc094dca9fcc0e9e
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 distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=android+pull+down+menu+missing PDF link annotation
    • http://kruengrangthai.com/files/files/90802918556.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/widemulorikapenig.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/berigaw.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/tebedaviradu.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/kagapoz.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1630516138.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613606c1367fd---somixap.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/43893471951.pdfIn PDF document text
    • https://shibbirs.com/media/files/juxurobijotelujise.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/79246295697.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/71331328430.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/bubutazezizasadudemasovat.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/bekiguzuw.pdfIn PDF document text
    • http://quetthe.com/upload/files/bikafufotagixuge.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/87413552567.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613107114fc20---72458224710.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/7966829179.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/93173448399.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/rukimigowi.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/vofimifonufujiredelademiv.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/90689189807.pdfIn PDF document text
    • http://espokebar.com/uploads/files/migenovibop.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_off0000d857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD857 10644 bytes
SHA-256: fda331abcf55e7f1be741f5ceee5598db5b4a7fb868b96d0693c8a99cacd414f
font_01_sfnt_off0000f07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001088f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088F 18064 bytes
SHA-256: 0a1581698e7c168f51f36385781411b292fa8c672450c772db7d8fb86e47c2f0

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