Malicious PDF — malware analysis report

Static analysis result for SHA-256 5410cf55445d6d96…

MALICIOUS

PDF

81.8 KB Created: 2021-09-23 02:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c23790fb3f9cc3a0864ccfd7a2efc22e SHA-1: d67800da09d0f9b576f8ffb0638343d29b751f7b SHA-256: 5410cf55445d6d96ea7c1597275d7000cc4098548837648e1cdd945cbabb8087
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs and is identified as a link farm, suggesting a phishing or redirection attempt. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and numerous external links point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://doluhosting.com/calisma2/files/uploads/gosilafaluwa.pdf In PDF document text
    • http://canxetaianhduc.com/images/file/45686621858.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/37328883224.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/xetixagujujote.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/bijabiv.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/52922066104.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/suzujezajozitevajo.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/42211954085.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/juxezumemixapexixatulifak.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/kemaluduselapulap.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/mikilaroresaladufokede.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b642d02bae905d1920b756dfe59ebdd0/43577000712.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb81acf7bf---44317836161.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/vigutozigusijuk.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/67249754372.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/dinejomiguwokew.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/11486956831.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/47134022591.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/88531821435.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/20473526948.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/64814842566.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109130316171500.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/bifixemukudelex.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/40139062233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=samsung+galaxy+note+3+download+modePDF 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_off0000d6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B1 11048 bytes
SHA-256: e00df0c4d80d266bb55371b3d0ca593fbe732f684ac3050416f889dcbeb7ad2b
font_01_sfnt_off0000f056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF056 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10868 19016 bytes
SHA-256: cc591de4978d741eb642c9a8dd4ea0f3d508b7e698ab9a1d735d507fe9f4d33a