Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ff4cbed6cc9cc3…

MALICIOUS

PDF

68.3 KB Created: 2021-09-28 00:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bb8de1cd6600d3d5fabcfc81c4b6405a SHA-1: 0904687204a0b5801c32255c304bc2aadd2200f8 SHA-256: b6ff4cbed6cc9cc3e2c7f72a6fae6c7b83553479592c9fcf6c280107fb82408f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of many embedded URLs points towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://doanandieuduong295doson.vn/namthuan/images/news/files/32991714801.pdf In PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/52572284688.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/bubosotusulawir.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/murekesurilarosilun.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/55787263809.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/61221282835.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/pr8lkm9qj1voe3p5jeegkk9cpu/42074836010.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/julupaginezaragov.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/tirimipixubikebusawugud.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/92025153735.pdfIn PDF document text
    • http://abc-tel.ru/data/File/96976243664.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/2024616181.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/niwazedanumafitigajidugiz.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/gagumurawubatazagefade.pdfIn PDF document text
    • http://grafittipng.com/userfiles/files/56538362418.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436ef39f2e5---lolaj.pdfIn PDF document text
    • http://delifarm.com/images/file/majakijirujit.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/7244499083.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/wogudimedalupukefupe.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/70001689533.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/12803690193.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/92014003485.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/37761947613.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/zabixudeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=basically+fnf+apkPDF 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_off0000ae18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE18 10280 bytes
SHA-256: 7cad707f2951494510b46e08e4c93845ff41b5176ef675e148b012f49a575252
font_01_sfnt_off0000c558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC558 15132 bytes
SHA-256: c02c71a70f5ca283dae1c47a0bd6f05174ff1273badc4b8598919c533514fd1f
font_02_sfnt_off0000ebbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1