Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a636d9e2ef885c…

MALICIOUS

PDF

71.8 KB Created: 2021-03-20 11:07:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3500cb75d0c6c3daa4cf7382e40fe7f1 SHA-1: 1e9ad981c9857fa23350be1ba2220336241d4812 SHA-256: 71a636d9e2ef885c3adc7848c1ac0fda7ac5dbb0e842365e8089f520a8c4ac4f
66 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier and contains multiple embedded URLs pointing to potentially malicious domains. The document body, though heavily obfuscated, appears to be a lure related to book downloads, directing users to external sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using disposable hosting for link farms, suggesting a campaign to distribute malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/award?keyword=mastering+algorithms+with+c+kyle+loudon+pdf PDF link annotation
    • http://nukels.xyz/32921723392hhlrl.pdfIn PDF document text
    • http://claire-irk.ru/sub_zero_refrigerator_priceuani7.pdfIn PDF document text
    • http://luxshop21.site/goxefuqbgvv.pdfIn PDF document text
    • http://brightshopbg.xyz/stock_markets_live_world0o0qy.pdfIn PDF document text
    • http://stebsmeh.space/guitar_major_pentatonic_scale_patterns2ikbq.pdfIn PDF document text
    • http://rollernefritmassage.xyz/what_is_the_difference_between_all_the_oral_b_toothbrushes50yl2.pdfIn PDF document text
    • http://sefexetewizu.iblogger.org/kokuzevorabilisirel.pdfIn PDF document text
    • http://subikizivuwen.22web.org/project_calendar_template_excel_free.pdfIn PDF document text
    • http://pugexemerupu.iblogger.org/how_to_use_bissell_proheat_2x_professional.pdfIn PDF document text
    • http://vseti.life/rikawugerufnk0k0.pdfIn PDF document text
    • http://wipunemobak.mygamesonline.org/agatha_christie_books_for_sale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lugegurofeso.epizy.com/the_emotionally_destructive_marriage_webinar.pdfIn PDF document text
    • http://dibalata.epizy.com/biology_11th_ncert_book_download.pdfIn PDF document text
    • http://nabafutig.myartsonline.com/sample_detailed_lesson_plan_in_english_for_high_school.pdfIn PDF document text
    • http://tubasip.epizy.com/arbaeen_nawawi_arabic.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/40771599686.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/17914991259.pdfIn PDF document text
    • http://suwetiwojiza.rf.gd/upakari_spoken_english_book_free.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_off0000dc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7D 5832 bytes
SHA-256: 907bcca300e018171b11f6202069c096751ec1a3274e8eb1f6030ee840f153b0
font_01_sfnt_off0000f052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF052 9908 bytes
SHA-256: 9e2aae4aa0efc2b9f74bddd1eb97d3d1e5123f5c12a7a7ccfa77faad2c5692f9

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