Malicious PDF — malware analysis report

Static analysis result for SHA-256 1800a3d2309cd750…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 09:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bb27f1518dc78b783924fc81f56ba706 SHA-1: 9b55714a107a9328d29a64ed4a3d4b664c10d245 SHA-256: 1800a3d2309cd7501240fd7dc20969bb6d398c2a6b6d022fba8247590627f408
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and numerous external URIs, indicating it is designed to execute malicious code and redirect users to potentially harmful sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=chhota+bheem+himalayan+adventure+game+download PDF link annotation
    • http://busankid.com/webfiles/board/file///lakevotewiwa.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/rerukinewevasitigukowon.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/3928089024.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/13766207825.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/88226448257.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/paxisikusate.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/a598262a2c929afc9b1042d5edc8f8ce/86912700096.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/juxurijevibekofefugegozak.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/18515460087.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/13813473080.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/bumaleridomeg.pdfIn PDF document text
    • http://kelvista.lt/images/files/39537494024.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/sivesobad.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/didaxavevugej.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/18075713979.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/2169540315.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/34895065362.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/43351996936.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/89476590717.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/37461133802.pdfIn PDF document text
    • http://montesantangelo.it/files/files/35260501719.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/51230414430.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/banebutexageme.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/rbr68m374v9ktdd9ar9rjja12f/55132045298.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/mawenujamebe.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_off0000d91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91C 19968 bytes
SHA-256: 3e1007c24a226b322dbd38ef76054356184c0233629c67b2e1497bdfa7d3b0d1
font_01_sfnt_off00010dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EA 11064 bytes
SHA-256: f029a601859f2e1e2e4966c1d0b1a3b02d55028fccd16b0686570f822c67f7c6