Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cfefede82494b81…

MALICIOUS

PDF

79.3 KB Created: 2021-09-12 03:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ead351cbf6ca9f53a86bb87532a7f440 SHA-1: ed3e8c263d01e64bad7d288ee6a358d8e53f7d2f SHA-256: 7cfefede82494b818d60e94a442b04a44eb55fb0f19fd72c6bee47d2c582a2df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable or unknown domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a pattern of using many links on disposable hosting, often associated with SEO poisoning or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://k-newsletter.com/ckupload/files/9380189702.pdf In PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b0suprkotqks4vo43ll2smfp74/38300517331.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/potadotukinabozenufitose.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/36549393478.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/17404243507.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/rifizif.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/58530914540.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/pamubetijefi.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/73280963911.pdfIn PDF document text
    • http://valeneighbors.com/userimages/kofesusegutuwemoduxal.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/25424200024.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/niropisotuwoxip.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/17249539677.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/sifixav.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210907182055.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/vufugemaw.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/famagi.pdfIn PDF document text
    • http://progetec.org/userfiles/files/63119972085.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/simuzagejasaziwapowate.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/bofapa.pdfIn PDF document text
    • http://otczenacts.com/media/files/33528399403.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/34028930370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+walking+dead+world+beyond+watch+onlinePDF 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_off0000c1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D8 10876 bytes
SHA-256: 973b5327f071060f01eaba6869032be716090122422811e50649930d3be4a1ad
font_01_sfnt_off0000dac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC5 23168 bytes
SHA-256: 7d89154b90b0da2817431f7955c581ac365b2f707c845568493568d5c66894aa
font_02_sfnt_off00011759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11759 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.