Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97c5c348ec6b718…

MALICIOUS

PDF

76.6 KB Created: 2021-09-19 06:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: af620cecb8c9ed4b8e06ef831309859d SHA-1: 003567fc159b57487b03dac34ef1959dee8b3c6c SHA-256: e97c5c348ec6b718b06840e70567e5abf87738a01b83d95d6e000052eef97c27
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful sites. ClamAV detection and ML classification further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://gwardiajuvenia.pl/zdjecia/fck/file/lujijopujinajopu.pdf In PDF document text
    • https://kede.org/userfiles/file/1939946700.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/94465985075.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/segukag.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/xawumomijakudulovi.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/zerepijaxukila.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210914010234728.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc67833ba8---vitemo.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/nukexekajojizetenizugareb.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/810117669.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/5d59eda2654186bff4bb186af8dcdcb0/pegaja.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210904073845.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/16430903085.pdfIn PDF document text
    • http://getvisa.ru/images/File/17593476156.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/xevaxixo.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/52444454470.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/34619839164.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109160647064100.pdfIn PDF document text
    • http://rhondachem.com/d/files/wuguluvusexajobapojijana.pdfIn PDF document text
    • https://halead.com/uploadfile/1631688994.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/jebizolulitudegagonifa.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/xulunag.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/17600764565.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/molube.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///fufaxavosuri.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/xovefobas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+transfer+photos+to+my+new+phonePDF 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_off0000c719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC719 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF30 10676 bytes
SHA-256: 3fc956dc408096ee3aeb65ca5aec6448e112ff6f35d1fc9e0de6ae848efe2316
font_02_sfnt_off0000f786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 17904 bytes
SHA-256: 4aa6d9624d4547f30b1e6e7c3fb16f4fef5f688299406725f785995af4775c60