Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d93cbcbf5e008e1…

MALICIOUS

PDF

72.7 KB Created: 2021-10-01 22:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e4c98479b63a684eb323fdc2c7e777f8 SHA-1: 0abb9c1d9a5e3eb2be651bdc49c81554e0b84995 SHA-256: 3d93cbcbf5e008e1a4c3fb120f78802476a718cf145f90fc41796832a3edaa0d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to other PDF files hosted on a variety of domains, many of which appear to be disposable or low-reputation. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high likelihood of this being a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://dvg.asia/ckfinder/uploadfiles/files/tulebagafagupamobekujo.pdf In PDF document text
    • http://frezerovka.by/images/fxeditor/file/75612295268.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/desedikamo.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/81852269850.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/vazofotoviperevovakumis.pdfIn PDF document text
    • http://fohow77.ru/upload/file/ritifeguvexoxisa.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/mebumenomudaxelal.pdfIn PDF document text
    • http://ehlibeytalimleri.com/resimler/files/88701576566.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/mibimulonenoxulatapovudi.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/nakowotexitu.pdfIn PDF document text
    • http://polletnv.be/uploads/files/xivev.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16156d8f915d89---funenoxunumoxebuse.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/pejejemoxukuxapudivore.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/najifajuxudalub.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/wewusesa.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1615010776c5f5---vidototabu.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/69846496128.pdfIn PDF document text
    • https://bdata.vn/upload/files/13648942395.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/bagabosomajoban.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/lukujedalu.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/newubitaromukosopol.pdfIn PDF document text
    • http://annabarons.com/files/files/gofuniludilagisorusilali.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/73795276369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pokemon+card+rarity+guidePDF 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_off0000b3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F5 18948 bytes
SHA-256: 0f8bf8e3f30972b9ad28c753679fe0c2b10a05dff3dfe9d86f47a8734a71b1d0
font_01_sfnt_off0000e480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC97 10804 bytes
SHA-256: fb65c030829d6f9da3233242ae37aa84541fe38d58c5c4096b88808a6b7f630b

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