Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3bdb0752d4dbae8…

MALICIOUS

PDF

73.9 KB Created: 2021-09-19 19:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 126442c72f70c774311b6f8fd4afcece SHA-1: 2871a335c49a76b9e238aa8210c0aa4b27bfbb92 SHA-256: c3bdb0752d4dbae8e0af3d373109c55089caa82f10914207d27e21fd644bfcdd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as link farms. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://greenhere.cn/upload/ckimg/files/202109160613513627.pdf In PDF document text
    • http://heyumpnd.com/userfiles/file///wodotirobalufedi.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/25029388202.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/bodojotodaruwuvibevokepi.pdfIn PDF document text
    • https://people11people.gr/uploads/File/vovegekeso.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/49319981705.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/56056205960.pdfIn PDF document text
    • http://med-os.com/user_upload/file/jepofutudinariso.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/32569745408.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/88040671513.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/nuwegolivuwokug.pdfIn PDF document text
    • http://keitbg.com/images/files/35938282873.pdfIn PDF document text
    • http://kag.fr/userfiles/file/fatax.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/47976938255.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143ed174f143---valakavisiraseta.pdfIn PDF document text
    • https://artenika.pl/fck/file/25117302897.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/77351667153.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/suzegan.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/zepibofowusoxajugi.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/73387700636.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614595173704c---44039549832.pdfIn PDF document text
    • https://x-software.cz/data/file/80920023807.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/bovagedoletojutewowajas.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/jobodafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=watch+demon+slayer+movie+online+fullPDF 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_off0000b9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C8 18000 bytes
SHA-256: dabb80f9e2714f55cf118f1208014797746b0c37cecb581ad737a6c88cfe4102
font_01_sfnt_off0000e84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10063 11016 bytes
SHA-256: b20255bd7888d0929443242317b4572fdbdd7acb5c1bdfc7abc9da30e7341dbd

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