Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3064e587b7914b…

MALICIOUS

PDF

76.0 KB Created: 2021-09-16 21:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8ddef542170097914eb705245d781882 SHA-1: 42c73408fbc45ef0057f3eacdf904e1252c18371 SHA-256: 4a3064e587b7914bc1a9eb60e48cd1e8ffc4727669bcba8ebe6869da174b6c08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to host malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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://hatinhjobs.com/upload/files/bevotiwidezemivuvexi.pdf In PDF document text
    • http://104408017.linker.tw/files/mapulipefujugetet.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/49347997683.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/70028837825.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/21957248769.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/lufekefarepapupor.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/fuzizaniwim.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/mulejujawiva.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/totoxidi.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/kemazunubopo.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021091210121273499.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/14702248931.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/3e6he76im6e47a26j956hnks7l/mamawitawivetifepovigi.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e67df18ffd---xumidugolegoloputokizixe.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/zobegexofosik.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/52817985231.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/33334310176.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/pujeka.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/9341678364.pdfIn PDF document text
    • http://mylodge-naoshima.com/xafuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=nom+087+semarnat+ssa1+2002+pdfPDF 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_off0000c000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC000 11048 bytes
SHA-256: cf7bfba5d794e19950dfc1f1d67ee113f0ee4e121afb63f637a2e1506d28508b
font_01_sfnt_off0000d9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F0 19324 bytes
SHA-256: c1ddf364a720b6d7a74649f62c395b33e8ec46914b46ab6667c42f4a5ac4e86e

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