Malicious PDF — malware analysis report

Static analysis result for SHA-256 147a2aa30e8affd2…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 07:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: a78fb3713809613e1af9f17300102add SHA-1: 2d0db7148071401ba47ba4d61bbbf167bdfdd43e SHA-256: 147a2aa30e8affd289f21433ed57b92d89fec273e10a63d9ae196dd0c55851ec
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://dungcubepgiangtrinh.com/webroot/img/files/36978200069.pdf In PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/wumivokux.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/6238489888.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/51346880567.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109020554171370.pdfIn PDF document text
    • https://keongracun.org/contents/files/sumizijidubux.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/paxosamugixoduduwataka.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/xamojaxejogoniv.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/33055226659.pdfIn PDF document text
    • http://itena.si/uporabnik/file/69165532306.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161342fb179863---bilojijufexuxapepa.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/bafuxokovalokar.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/xiwezavipitirap.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/73510617460.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/lilodu.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/42318564283.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/wufedefoxowixi.pdfIn PDF document text
    • http://precisao.org/files/files/13171783377.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/49308183388.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/15174069505.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-4/20210904163838178107.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d88ed24ac---zorozuzebuluzolavi.pdfIn PDF document text
    • http://gibisch.org/files/files/xokizeronos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=paris+jayaraj+full+movie+in+tamilPDF 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_off0000d5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F7 19268 bytes
SHA-256: 337db1d77c3485e8a757bf2665090009575d85039befae95a1f4a42ff5b4f035
font_01_sfnt_off0001083e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083E 10788 bytes
SHA-256: 00cd3c91b7795dbdcb848116a3fe8dd7516091a3db66b7a6eedd5d82c00297f7
font_02_sfnt_off00012116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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