Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be9ac7783e3b868…

MALICIOUS

PDF

71.9 KB Created: 2021-09-23 03:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3fce3c069a58e9a0f6da2be866ab80c4 SHA-1: 020cb8003fefe8b236ec0ab45945a34bfecf39e0 SHA-256: 9be9ac7783e3b868b3aa2e8660706814744790f8dc6a6b48780039401b564e18
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oralrem.kz/ckfinder/userfiles/files/negovamivogojukejelejap.pdf In PDF document text
    • http://ahnil.com/userData/board/file/najoz.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/41623000589.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/jumoburotixiv.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/jenuvitevuxefitaxabefuxa.pdfIn PDF document text
    • http://regmac.net/userfiles/files/18482200701.pdfIn PDF document text
    • https://energooptima.hu/upload/File/64300488159.pdfIn PDF document text
    • https://hoongnau.com/upload/files/botiporipevileg.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/dasopuxozudupego.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/31302342419.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/11814917575.pdfIn PDF document text
    • http://askort.pl/Upload/file/kudevavaxigegoref.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/84456403965.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/bakebadi.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/defutobonefeminujodaf.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/fonsldg233dm11qghbub04evll/97061254673.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/22767051943.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/zozukosavawatasowax.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/94903577304.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/27415008702.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/60125482621.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/jipame.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/1227936238.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/28319876117.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/89152920396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=www+telugu+full+moviePDF 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_off0000b911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB911 16180 bytes
SHA-256: 8f74878f2641e8b34be76c9e91e52f59032ed7b91fe3f2dd8759a13993f4888f
font_01_sfnt_off0000e2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B6 10268 bytes
SHA-256: 34972099a6c0cca81e138fc66785e4476bc418f5f2b5e8ce75ac55a5c833234a
font_02_sfnt_off0000f9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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