Malicious PDF — malware analysis report

Static analysis result for SHA-256 d440401625f1c850…

MALICIOUS

PDF

81.0 KB Created: 2021-04-30 09:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 77822bc7c14692d2ad2160f5bf13c5d8 SHA-1: bc7fe61686d577d59e354135941aa719c4fc6457 SHA-256: d440401625f1c8502b31977ba88ff7d0a86d593c70d2820f3592dd5c1fda08c8
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier strongly indicates maliciousness. The presence of external URIs and the structure suggest an attempt to redirect users to malicious sites, likely for malware distribution or phishing, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=best+oil+for+predator+4000+generator PDF link annotation
    • http://consequences.space/kobold_adventure_guidealh3d.pdfIn PDF document text
    • http://dovejeve.22web.org/percy_jackson_and_the_sea_of_monsters_main_characters.pdfIn PDF document text
    • http://vehicleinsusa.com/53106771654a2qia.pdfIn PDF document text
    • http://smotrikino.fun/best_4k_gaming_wallpapers_for_laptop6dxx9.pdfIn PDF document text
    • http://xebobimifu.22web.org/bladderscan_bvi_9400.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/dCCjhXr/s_word_wallpaper_in_love.pdfIn PDF document text
    • http://irisca.online/40632614670vuoqy.pdfIn PDF document text
    • https://cdn.sqhk.co/fotinegataso/aOF7ihc/xemifazusiz.pdfIn PDF document text
    • http://basavuteg.22web.org/degatewamabesivulolitamem.pdfIn PDF document text
    • http://lozosomegav.iblogger.org/roland_micro_cube_bass_rx_for_sale.pdfIn PDF document text
    • http://kixetojonomezad.22web.org/the_following_ink_cartridge_cannot_be_recognized_canon_mp250.pdfIn PDF document text
    • http://biweekamnf.com/bed_psychology_in_telugu9d0dz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7088d148-847f-48c7-b4e8-14500e41dde4/x99_rampage_v_extreme_edition_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1181e5d8-16d7-4e38-a55e-5509b1aed8e7/polk_audio_subwoofer_psw110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d0c1b09-0f24-4133-bcb0-cd1051dcaa58/can_i_watch_the_witcher_on_amazon_prime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e336f10a-67af-4bd9-9474-c69270b2590b/special_right_triangles_word_problems_worksheet_answers.pdfIn PDF document text
    • http://manovubiludigi.rf.gd/test_de_apgar_definicion.pdfIn PDF document text
    • http://lusiromipu.epizy.com/virewuberorekeniwobuva.pdfIn PDF document text
    • http://talakukatutevib.epizy.com/59497617695.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c17d938b-047b-4d5c-bfdb-9f066ab19741/2010_dodge_caliber_owners_manual.pdfIn PDF document text
    • http://buxebawimiro.epizy.com/50118301114.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
    • 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_off0000e5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 5488 bytes
SHA-256: e4f9b657897e2ca43b0e26bf1bad0f675502b55a3abf4300bd7ee4d423af6843
font_01_sfnt_off0000f879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF879 11676 bytes
SHA-256: 72d30f34231101f67a60d57bf9f9ba2fb2e010ee60a7da8f7e1bd89ccad68878
font_02_sfnt_off00012074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12074 16540 bytes
SHA-256: 7d8c3b8bd031c82e780574da76120462e6465b19fcd87629df9fdc401184d1f1

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