Malicious PDF — malware analysis report

Static analysis result for SHA-256 467b89da54b40c99…

MALICIOUS

PDF

86.7 KB Created: 2021-10-08 13:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a4faa1bb1345964f3eb4da685143e49e SHA-1: d731e64e7d277747cccbdfd4f9c68dba69985b17 SHA-256: 467b89da54b40c996959d96de91c639b268702c3add9a9a29081fccac8c3a301
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 suggested by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, which are often used in phishing campaigns or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://hamasataccessories.com/userfiles/files/30106156241.pdf In PDF document text
    • http://exim5.hu/_user/file/79172806717.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/nuwekugonober.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/nexumafunobotobi.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/3394831042.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/21987696471.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/95774878156.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/tazafez.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/gusakibonizixitivijava.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/xuxodel.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/pesunutowi.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/41819786793.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/sevokizisal.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210916005037.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/makuguxozivokobekevi.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/63536133946.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/ratijas.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/86789079626.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/natofepedizorezotimuw.pdfIn PDF document text
    • http://wixoon.hu/upload/file/riruvapi.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613abe2daf022---wolutikupegufe.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/jinaxo.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/12462347548.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/geketerejikedoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=of2+lewis+structure+molecular+geometryPDF 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_off0000e548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE548 11020 bytes
SHA-256: bc9bd12a439ee7b098fee599a631129ec967a4ff166b90b46469e53479f3e5c3
font_01_sfnt_off0000ff32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11744 20496 bytes
SHA-256: 697141f0e50cd3af9f13d4a2c85232249136cadc0ebf41ab15b877be75b3dad4