Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d6a6a9db53afcfc…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 01:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5ee353469d11ac8e21789d59bee5f89d SHA-1: d4f0b74da31120e4d8b62e0af801d3a64a92ea26 SHA-256: 7d6a6a9db53afcfcbb31f697dc390b58f03ed0cabd47d7129539c37919528991
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://smidgel.ru/uplcv?utm_term=kingsoft+office+apk+for+pc PDF link annotation
    • http://cesnek-vysocina.cz/UserFiles/File/63170267540.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/7182744174.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/relexuvirivetidi.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/goxanopo.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/nanubupedajojowonawep.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/2629974462.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/xuxusopekipas.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/nubupetituvukusuwax.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fde13474a1---18604743646.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/vefanorofisifegomo.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/dupobepafatipe.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/ribemewumozamusuge.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///22207647724.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/19989018837.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16149cef59fac5---besaxefulejomel.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///gazabilinajilatawi.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/44854085331.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/75497679771.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/kivamodufurumabatefegum.pdfIn PDF document text
    • http://szcftz.com/upload/veraloja.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021090923521273499.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_off0000aebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBE 10692 bytes
SHA-256: b1e7ddc6c8bde57f914b531e3d7ddcedabf264dd476822408d2155802d18b920
font_01_sfnt_off0000c774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC774 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF86 15884 bytes
SHA-256: 0eaa5ab00cd57fd6a041fe2291b81b9988858fbe617daa37bffefdd5cafba475

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