Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ee4b4b4a54edda…

MALICIOUS

PDF

80.0 KB Created: 2021-04-13 08:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 5e95cdc789b2e633923d54536332893f SHA-1: 2b8ca7afddc966e591fd15f4548e3bdd493a980f SHA-256: 28ee4b4b4a54eddab3928d2074a513355dc4d521a8a927f8ca47c9516ff2c78c
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF files hosted on external domains. One of these links, 'https://kuzutuzo.ru/strik?utm_term=the+soul+collector2020imdb', is directly embedded and suggests a malicious intent, possibly for phishing or SEO abuse. The ML classifier and ClamAV detection strongly indicate malicious content, aligning with a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/strik?utm_term=the+soul+collector+2020+imdb PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450041/normal_6002dd64eda7d.pdfIn PDF document text
    • https://nafezukame.weebly.com/uploads/1/3/2/3/132302716/3792238.pdfIn PDF document text
    • https://tapukinag.weebly.com/uploads/1/3/1/6/131606864/kekapagaj_kamadenuneku_kufig_memaz.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/ghijeij/vr_movies_free_online_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/suwinodujeja/ihMjeEs/eeo1_component_2_report.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470967/normal_5fe1c3d1564c2.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/NfibrC8/among_us_2017_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/jagapifa/jbwnOhe/wenajige.pdfIn PDF document text
    • https://cdn.sqhk.co/ramawuvade/clZNji0/85034199254.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479933/normal_60133432bdd14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375206/normal_60283a754d9b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_600a5a514c455.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482002/normal_5fdc43668c59a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387036/normal_5ffa861ab91ea.pdfIn PDF document text
    • https://cdn.sqhk.co/xodakebebit/jZia1kq/escape_plan_movie_cast.pdfIn PDF document text
    • https://nawiwunusuwo.weebly.com/uploads/1/3/2/7/132741181/5120587.pdfIn PDF document text
    • https://cdn.sqhk.co/nobuwinulad/c0Biaia/basdai_score_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/jesuzedavoti/hiicjir/successful_cover_letter_templates.pdfIn PDF document text
    • https://cdn.sqhk.co/dutudovajud/fgjbhad/what_do_crows_eat_in_the_wild.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nasitevu/free_happy_birthday_card_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/gopro_hero_4_session_manual_cz.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/apk_blibli_versi_lama.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_off0000fa85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA85 5332 bytes
SHA-256: 66b4f2414e8fe30a583c63128cd6d4644bb76890b061786828ac93014e67061e
font_01_sfnt_off00010c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C79 11120 bytes
SHA-256: e28f695abbdb9152a42793046d1e732042c37f60f7c3e0a1ff46ccff0319267f

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