Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d6fd4235476f19…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 07:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 87d8dee9f8b3b6aa5e8d310d6e67455c SHA-1: 8f21ac7d5dd938189d2c88750045a069348fd576 SHA-256: 89d6fd4235476f19f8fb6667c294b1879a44a5f86b146bbce6102378f92245ae
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to other PDF documents hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that these links are likely part of a link farm strategy, potentially to distribute or promote unwanted software. While no scripts were directly extracted, the presence of embedded URIs and the ML classifier's high confidence score suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 4

  • 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://activsport.ro/userfiles/file/kudetodazanomusizimagi.pdf In PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/42997479138.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/geliravoxuzajopufo.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/5011269258.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/wujagigafuka.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/63876423117.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/jonobaropujatov.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/gaxisoresedudasipaso.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/bixojajom.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e457265af1---2467799624.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/27220783633.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210901_131949.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-14/20210914041030271218.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/59572178520.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe0fea9d21---37064945281.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/piroloxitupetez.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/202193144597980.pdfIn PDF document text
    • http://client.diffuse.info/files/texisomaxevofabeg.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/21211179674.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/gotesovo.pdfIn PDF document text
    • https://toocapen.com/files/99656247135.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/rivirujumanaradajuwiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=download+whatsapp+apk+for+pc+windows+7PDF 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_off0000da6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF281 17340 bytes
SHA-256: 66203a58c75bc14037b4d4fae231d142e4b5f6b079f4a7bb3df8be48fe7bbb93
font_02_sfnt_off00011f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0F 10812 bytes
SHA-256: a77925b2da028b6d7da6bce2c4892236a10fb1a99e387858f1c5b873e291594f

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