Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8fbad8c301fc795…

MALICIOUS

PDF

69.5 KB Created: 2021-10-02 20:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c6d3034cbae13daa9a2c381e15d38e9e SHA-1: 4e58637ac82bcdc7ffda2c36dc700a2ca00d94f4 SHA-256: e8fbad8c301fc79516baa41b80c824c66a3fb1b064ae2fbe347657b788c56696
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it is part of a link farm designed to host multiple PDFs, likely for malicious purposes. While no scripts were directly extracted, the presence of numerous embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme, potentially leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://funcarele.com/ckfinder/userfiles/files/7716761464.pdf In PDF document text
    • http://mirutte.com/newsfiles/files/molixutovigenazofuxaxenug.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/sekigajekuwem.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/67543349094.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/pawulatupetajulifemekeses.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/6ornnei95hn7jr4hn5idtqjokm/36269384681.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/xutinekizo.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/sebadubuto.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/94386440831.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/xozijiwaxix.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/67207040260.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109271711383473.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/tujekawazadopozu.pdfIn PDF document text
    • https://alibaba-cave.com/userfiles/file/jijelibe.pdfIn PDF document text
    • http://okvin.org/userfiles/file/kominusomebusilari.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/bedinalib.pdfIn PDF document text
    • http://3sdent.com/upload/files/94331750668.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/28589674969.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/11498720128.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/vaxen.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/15523098681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=dispersion+of+light+in+englishPDF 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_off0000adfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADFB 16888 bytes
SHA-256: 283b548f8a7f4ef505882c49a66bd8cf9c33ae60e93c2770618ee78fd2fbff35
font_01_sfnt_off0000d905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD905 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11C 10476 bytes
SHA-256: b3b1d7a72f0d2d6b8adc25d63612dacb262874d4b6086ed923b1520d30b88de2

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