Malicious PDF — malware analysis report

Static analysis result for SHA-256 558ab282328236bf…

MALICIOUS

PDF

93.4 KB Created: 2021-03-26 01:03:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 937badfa15c3325210c00ae9440fa904 SHA-1: 17ab29b627d927cb1e6b2cd058e490ebde539b94 SHA-256: 558ab282328236bf568ba3b0dc5f956bb361993bd7b55a3d8bcc31eeb562f4a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with one specifically pointing to a suspicious domain ('dafemum.ru') that is likely part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dafemum.ru/123?utm_term=wireless+spectrum+analyzer+app+android
    • http://bixaxivajujojar.mypressonline.com/human_circulatory_system_diagram.pdf
    • https://cdn-cms.f-static.net/uploads/4450890/normal_603c2c4f4316c.pdf
    • http://7lessons.space/335689693986dxie.pdf
    • http://gosunenibunale.getenjoyment.net/curso_aprendizajes_clave_primaria.pdf
    • https://static.s123-cdn-static.com/uploads/4479214/normal_5fde4ba489a42.pdf
    • https://cdn-cms.f-static.net/uploads/4368977/normal_5fd22fbbebc02.pdf
    • http://nikaold.site/33415135796bb1fj.pdf
    • http://hempmap.ru/is_blender_good_for_video_editingibjvw.pdf
    • http://kozidozilujivox.getenjoyment.net/gokipunerovu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vagoposejexuma.epizy.com/2918287052.pdf
    • http://pexirud.onlinewebshop.net/tawukunuwitapejulo.pdf
    • http://lexaxixamu.rf.gd/ukulele_songs_for_beginners_youtube.pdf
    • https://uploads.strikinglycdn.com/files/addddfda-d4bf-4315-9ccb-51d7b96ba0a8/statistical_learning_vs_machine_learning_quora.pdf
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_ef3ec5db503a4cc98a5f5ec0d1e7ff22.pdf?index=true
    • http://zevusup.atwebpages.com/the_joy_of_sex_book_chapters.pdf
    • https://uploads.strikinglycdn.com/files/e3da5e8e-b239-4323-99b7-95ce404449af/tipifilijomibobizubaladu.pdf
    • http://kubijizexex.rf.gd/89135768840.pdf
    • https://uploads.strikinglycdn.com/files/f31d1b60-4fce-4774-84b6-f3b5abe2ad54/how_to_disassemble_maytag_washer_agitator.pdf
    • http://kezasifofajimo.rf.gd/immunisation_side_effects_sheet.pdf
    • https://uploads.strikinglycdn.com/files/af302aa2-1be7-4b5e-8e0e-307daf8d8f08/english_literature_authors_timeline.pdf
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_662167ef699d4a82aaf22359f33ba08c.pdf?index=true
    • http://xifebudi.epizy.com/ruvel.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b22.bin
1e4efcbda3dae755fdaf8800abe801b7687fbcb1e2e943c3df3c68327e68922e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B22 5384 bytes
font_01_sfnt_off00012d73.bin
fdad13a7e6149c1acba68837ccf4bcca6223b47e26d67e8e6ccbed22c415d99d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D73 11044 bytes
font_02_sfnt_off0001529d.bin
1ffca1ef16be5e2ec436e77f9211a88ad3199dc781cb76600401cc2e2c7dce6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1529D 16140 bytes

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