Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c31b7624d414564…

MALICIOUS

PDF

94.7 KB Created: 2021-04-11 13:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: f92b40b69b693e54b52d8b75b87d3dd1 SHA-1: 9736a3d5095bd9632dc3ee74ed64c463ee6d5d46 SHA-256: 8c31b7624d414564312074d49f7c0c0b05b7126beb653b8664b2ab4b08cd33c9
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a prominent one leading to 'fokemale.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a malicious intent to redirect users. The ML classifier strongly flags this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://fokemale.ru/strik?utm_term=los+juegos+del+hambre+1+en+netflix PDF link annotation
    • http://pozesex.iblogger.org/philippines_reports_more_african_swine_fever_outbreaks.pdfIn PDF document text
    • http://easylearning.space/fichas_de_lectura_y_escritura_para_primer_grado2obar.pdfIn PDF document text
    • http://jitufar.22web.org/19735021181.pdfIn PDF document text
    • http://lnstagramcentre.net/nufeviputa9h2ke.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/huIhhhx/skyblock_mcpe_servers_fr.pdfIn PDF document text
    • https://cdn.sqhk.co/dufubimaru/igQgcgf/39444242800.pdfIn PDF document text
    • https://cdn.sqhk.co/vapadexeb/gdjgYge/20769280094.pdfIn PDF document text
    • http://teligelufinuv.iblogger.org/zobimeti.pdfIn PDF document text
    • https://cdn.sqhk.co/rowazazapa/hLugcgd/free_slot_games_online_with_bonus_rounds.pdfIn PDF document text
    • http://card2card-perevod24.site/blue_rose_flower_images_free_hd1u5l3.pdfIn PDF document text
    • https://cdn.sqhk.co/fubebevukad/sqVBpgj/nawowosevi.pdfIn PDF document text
    • http://nijuwebil.iblogger.org/georgia_driver_license_test_book.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/RQja11G/14427311811.pdfIn PDF document text
    • https://cdn.sqhk.co/jedepazisu/ePdGjcV/32907576983.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gapusamini.rf.gd/vudenabebajemaka.pdfIn PDF document text
    • http://pakewon.rf.gd/nulabozasalomag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74b13fc4-a1d5-40b8-875c-2945dc570b80/how_hard_is_the_aphg_exam.pdfIn PDF document text
    • http://nelaxufap.rf.gd/what_is_the_best_deck_in_mtg_arena.pdfIn PDF document text
    • http://xunonevikonog.rf.gd/nesekegoxininezuvisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/decabbca-c89e-491f-8aa1-43d97f88cc93/72552674867.pdfIn PDF document text
    • http://nifibomagogov.rf.gd/fusiform_brain_aneurysm_symptoms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05fbf256-9e27-421e-8e83-102f20251db8/81724196038.pdfIn PDF document text
    • http://dumadanovoj.rf.gd/ayatul_kursi_printable.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DED 5596 bytes
SHA-256: f628d0dfff1b48a58dc70107cd6d24e53358750c16c54b073bffae6b8518b70c
font_01_sfnt_off000140d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D9 13212 bytes
SHA-256: 78310c13c6905cc0caabec87cfe2b4ad11e8d5a34a044d68b951dca20a56d564

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