Malicious PDF — malware analysis report

Static analysis result for SHA-256 9efaabf47379e7be…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 13:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ce0b29b74dbf58c18d0ae6b27a176e12 SHA-1: 4647fe11536f98b4aa48501276ec7bb9078186ff SHA-256: 9efaabf47379e7be783268a8cbbd2b20fe7331b1c9c467a56d45711b304dc591
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded links pointing to various domains, indicating a link farm designed to distribute malicious content or phish for information. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://darslaska.org/ckfinder/userfiles/files/81347474087.pdf In PDF document text
    • https://martan.es/cenavarra_userfiles/files/36806491232.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/tuzebesekup.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/23271570032.pdfIn PDF document text
    • https://premiersuli.hu/files/files/pamux.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/mifigesubaf.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/domipuwojuzoliporujeje.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/zuvudikositoduninomubos.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/genixitexizukabi.pdfIn PDF document text
    • http://krupongs.com/images/file/4567459816.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/11871940004.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/besup.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/jimixukanati.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/48618189379.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/polijavufudababojij.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/52371989567.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/gasoguxufugusejuxo.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/luput.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/kubuvefufalupa.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/kojojaneximutidizuvifaj.pdfIn PDF document text
    • https://limadelimon.com/images/file/pibimumumow.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/xigedererenujupiwa.pdfIn PDF document text
    • http://youil.org/userData/board/file/movugudodu.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/28297767944.pdfIn PDF document text
    • https://pkbae.rs/files/14160752488.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/99077715377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=seven+deadly+sins+season+4+episode+2+english+subPDF 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_off0000b043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB043 14848 bytes
SHA-256: bb670e04408e41a0a197f2e5fbfeda38253124e13f0e71a53c0b93adf01635e7
font_01_sfnt_off0000d552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED69 11168 bytes
SHA-256: 4ff4b19b1f109339c90eb78f7431c54bae012faf364cb603496afb85f234370d

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