Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f9b56ff63f78e3e…

MALICIOUS

PDF

71.4 KB Created: 2021-09-16 02:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 775cd3520c60c785e0e9950a7734921e SHA-1: 6e7a29768d73c74156d3495ca37e979adf5f11ff SHA-256: 9f9b56ff63f78e3e4e0e09e1194318af8905037ad4942394f7e3c96a4554a01d
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with many pointing to domains that appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/bc3f264356245ee9973198aa39484198/64634936826.pdf In PDF document text
    • https://curtain.jinware.com/upload/files/30481998194.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/8414152384.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/36921033198.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/61146626494.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/74887025407.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dugoxu.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/lubupisoke.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/16989093323.pdfIn PDF document text
    • http://jinyezi.cn/upload/wonim.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/fabazojo.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/90965158612.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/90319351425.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/kuxar.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/64637535280.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/105bef35cc8e1fa88688f5ca0a22a5e6/zulixuned.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/96914437923.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/40271184727.pdfIn PDF document text
    • http://crm333.com/documentos/file/kugotikukimiti.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/dazaguzuz.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/59337768530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=what+is+best+music+download+app+for+androidPDF 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_off0000b3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FE 16616 bytes
SHA-256: d5e7b39db3db5bb950029e6c02be8c13d3b8ba8a449827c5d670797aeb0f1419
font_01_sfnt_off0000de25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE25 11204 bytes
SHA-256: ced8106dc1e4a2d71cb91c6a3f75b6b98cc5032e85f42c3de4aed8454c7e6088
font_02_sfnt_off0000f805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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