Malicious PDF — malware analysis report

Static analysis result for SHA-256 21495304cb8a45db…

MALICIOUS

PDF

78.4 KB Created: 2021-04-25 14:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 65e5dfa6831422b3dd1a3f2d1ad3166e SHA-1: 7e6312fad5aa7b592d54f118ec07d4eddcc75b17 SHA-256: 21495304cb8a45db463bdcb4aaf94cd90a633780b3e26e003aec3c334ea42176
76 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a malicious SEO redirector link, disguised as a free download. The primary URL identified, 'https://zajinet.ru/strik?utm_term=guitar+method+book+1+surf+rock', is used to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to trick users into visiting malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://zajinet.ru/strik?utm_term=guitar+method+book+1+surf+rock PDF link annotation
    • https://cdn.sqhk.co/nebinefis/HgcywWo/corporate_strategy_salary_london.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423430/normal_6034201d4ba84.pdfIn PDF document text
    • https://cdn.sqhk.co/vigesiji/hvgggjd/nermeler_ve_bileik_nermeler_9._snf.pdfIn PDF document text
    • http://hydraruzxpnew4af.exchange/7538036601066qxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419413/normal_5fc5f5e868adc.pdfIn PDF document text
    • https://cdn.sqhk.co/tolononof/iehgfia/download_red_ball_3_game_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/bapuwanuvadi/ggjjgjc/flip_30_goal_zero.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446390/normal_6048c84585e40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416919/normal_601aad9278e63.pdfIn PDF document text
    • http://powerpoint4you.ru/34735769848ws17k.pdfIn PDF document text
    • http://krokoboko3.xyz/fikakobata62eww.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/863ea333-6412-4a8d-9ba9-8cf001b5aed4/fujujalesixejogedajof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1fcd7cf-c252-429b-b09c-341aa7e5020c/how_to_clean_pressure_washer_nozzle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c151edd8-3342-4f19-95f5-f18deeafb08b/how_to_tune_a_husqvarna_455_rancher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc1eb78f-7aad-45b4-bf1b-1581a7b2d71f/la_biblia_reina_valera_1909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68fa3125-a995-4e59-8c79-8fd8e4b4a6e1/opel_vectra_c_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c751686a-5290-4f67-8b53-dfe6d3a96522/how_to_find_angles_of_a_4_sided_polygon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df6f3cd6-a024-4f15-a3bc-a2260d10fbae/best_wilderness_movies_on_amazon_prime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/095b1b69-821e-4b6c-9765-2dc9baaffded/the_story_of_one_direction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40e83892-962e-4279-a77a-aed83714eeac/xamubotom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63a78b56-6f27-4ee1-b231-5f5e7ccbfa3a/20289526001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebde893d-610b-42f9-8194-f6ff92052b5b/rotosexup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/547d42a6-c01b-4041-8843-f05f28233a46/pewipetetukevelati.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_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 5516 bytes
SHA-256: 691aa4db3e684b8605639633398e4ff99ae8f7d1af3cf97d3dfbfacabef46217
font_01_sfnt_off000105b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B5 11088 bytes
SHA-256: 230ed868c70c0215f61c9a0c09e417ceaceba08bd5eef66e928b9737773a3a6d