Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b662eacfec74968…

MALICIOUS

PDF

69.5 KB Created: 2021-09-29 03:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 54bb0f288d84f8409b97d91542fb8806 SHA-1: e9cc83b09ecb0d3e09d5b0c4ba2a2fd311e52664 SHA-256: 7b662eacfec749685208a99619d17ffa5d11a0a2c27ea087f9e31ad3f170909c
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicated maliciousness, and the PDF contains a high number of embedded links pointing to various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are used for SEO manipulation or to distribute content. No scripts were extracted, but the nature of the embedded links suggests a phishing or content-luring attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 4

  • 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://presstone.hu/userfiles/file/14274509946.pdf In PDF document text
    • http://toitureetfacade.fr/data/Files/nudutozuvepuvazogunu.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/miwomukovodugomojijijoxof.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/maparoloxezaze.pdfIn PDF document text
    • http://ge-mak.com/files/nemevoponilivosezogatil.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/39483913551.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/xivaza.pdfIn PDF document text
    • https://go2germany.ru/files/file/75952484336.pdfIn PDF document text
    • http://agilesolutions.in/uploads/xebozumag.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/zutemenaz.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/64041685948.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021929752145830.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed0dc09fe0---vixuvoxaxexalenosudusu.pdfIn PDF document text
    • https://davnosti.ru/upload/sanivosid.pdfIn PDF document text
    • https://tigaintan.com/contents/files/39922158203.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/maretuvetewegafilawor.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210921093752111.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/gokatiwipubesupezipoxanat.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/71722814101.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/wiropiseguz.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/13487974174.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/74469450247.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/22729926194.pdfIn PDF document text
    • http://nwmanagement.ru/generic/uploaded/file/95969255180.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/siwezipexitulixepijoze.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/7879230985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=different+protocols+in+network+layerPDF 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_off0000b1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B9 10768 bytes
SHA-256: 31be0bab03a872cb00da5d0f50f05cf2fb6496331fc3fd0670f6e4909da3eaaa
font_02_sfnt_off0000e2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B8 14940 bytes
SHA-256: ab94b2f8af5064c76621b0a9ad3291713fb5a61b2a451998c10e8a093beedbd1

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