Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b43d6d65bb9884e…

MALICIOUS

PDF

77.6 KB Created: 2021-09-17 09:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 61dd3dbcbacd950bc2a650682ff80fa5 SHA-1: fbb16cd2c070a53f3b88b2af3a1beb1a68797da2 SHA-256: 8b43d6d65bb9884e08f9c6dcd785d66c1733a0756d499c2ecc5524390cbc3312
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The heuristics identified the PDF as a link farm with numerous external URIs pointing to disposable domains, suggesting a phishing or malware distribution attempt. The document body was unreadable, but the presence of many links and the high confidence scores strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://anapharmata.hu/ckfinder/core/connector/php/files/tewibinowavokojo.pdf In PDF document text
    • https://wupaojichangjia.com/d/files/vogulamadulivikufekasevu.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/43801680962.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/kokegese.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/tafimodizopideji.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/tupozajevemodogixa.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0e46c9107---wixitowogigugakuwise.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/mupilo.pdfIn PDF document text
    • http://naucharts.com/ckfinder/userfiles/files/gefikisiwuruneg.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/dabaxeru.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/tiwarurata.pdfIn PDF document text
    • https://protum.se/file/35914367657.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa7c87674e---safojiguzoze.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/12728087407.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/35652658064.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/6332869510.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/ditulapitap.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/tegudipavoruxemokebojatow.pdfIn PDF document text
    • https://emenu.hu/editor_up/bivereduxu.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/89889901385.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/24469128162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=psp+emulator+mobilePDF 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_off0000ca9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9E 10548 bytes
SHA-256: 94af0ffc2eabdc83330b30810372f779707b168422789bb67cee0524f7e22fa7
font_01_sfnt_off0000e27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA91 18004 bytes
SHA-256: 00f3db7f591ca8fe7b21686a49af9c8b26597a7d1cfc285ce1940875b38a6519

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