Malicious PDF — malware analysis report

Static analysis result for SHA-256 4227a4d8ce495721…

MALICIOUS

PDF

69.7 KB Created: 2021-10-02 22:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 43c1c663b482b29882b32f9f8e5859f8 SHA-1: 3ab279be59883ef6dd07b89e69fab34e298ee4b7 SHA-256: 4227a4d8ce495721f780d597d18f7e5b35ef4d4d9bf1adb09c534e0c57ed5b65
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, many of which are hosted on domains commonly used for malicious purposes. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing pages or download further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://sportuna.be/ckfinder/userfiles/files/10033129444.pdf In PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/garesavigivopixopafijevon.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/riwidevowotapidodeb.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1632682711.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/26230552139.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/jorekabavilaz.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/64400941905.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/13799112802.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/58843541820.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/63573970939.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/fikimulixebafel.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/fevelikoderatepep.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/45975030442.pdfIn PDF document text
    • http://topp.pl/_topp/file/wunagasiruloserekakanomuw.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/gokedevagutitiropov.pdfIn PDF document text
    • http://bscartridge.com/pic/54945689661.pdfIn PDF document text
    • https://docommerce.co/calisma2/files/uploads/61124396977.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/7618787942.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/49183491553.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/21163466698.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/4aa713c23fb80eb9c581489b18c5402e/89581765319.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/383012201.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/71290717828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=snipping+tool+osxPDF 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_off0000aff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF5 17008 bytes
SHA-256: 57d2afbed90f4715d0e3f35c69450441118baa95d5508f1f1484ba515fdf5f35
font_01_sfnt_off0000da15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA15 10212 bytes
SHA-256: 8afa7c2cc371d663c69c743ddbbe605855ecd9710967be3a446adda5ab4f7936
font_02_sfnt_off0000f10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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