Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f9ca0d0b531662…

MALICIOUS

PDF

75.6 KB Created: 2021-05-16 10:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 390a400929210ed74c7b0658b26a908a SHA-1: 0cfd87eb51be3e86b42721929a55af42f59f89d0 SHA-256: 55f9ca0d0b531662c1feb9be4b31d86d0dbbfc13c51e8ebe6013b6ada5749c60
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with at least two pointing to suspicious domains ('xajibur.ru' and 'vadonodip.22web.org'), suggesting it's designed to redirect users to phishing or malware-hosting sites. The document body, though heavily obfuscated, appears to mimic search result content to disguise its malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/strik?utm_term=is+insignia+a+good+tv+brand+reddit PDF link annotation
    • http://vadonodip.22web.org/sta_rite_well_pumps_near_me.pdfIn PDF document text
    • https://xojumupaxasa.weebly.com/uploads/1/3/4/6/134605953/vodirawi.pdfIn PDF document text
    • https://tulugawaluga.weebly.com/uploads/1/3/0/9/130969515/kokuvoja.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/ZhbCTTP/60905346311.pdfIn PDF document text
    • https://cdn.sqhk.co/rerunagakiz/haQEjgf/american_history_quiz_online.pdfIn PDF document text
    • https://cdn.sqhk.co/pedagukar/hamhcuw/fazitejabo.pdfIn PDF document text
    • https://cdn.sqhk.co/xipitufekaru/NUig3jh/94985384679.pdfIn PDF document text
    • https://cdn.sqhk.co/dokadajij/ijBThg3/smart_balance_butter_light_ingredients.pdfIn PDF document text
    • https://cdn.sqhk.co/fivuwunar/QUhNhiO/75882958061.pdfIn PDF document text
    • https://ritibamubube.weebly.com/uploads/1/3/1/4/131437410/pugepulab.pdfIn PDF document text
    • http://xunidar.iblogger.org/why_is_my_nespresso_milk_frother_flashing.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/vebenok/centrica_annual_report_and_accounts_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/70317733451.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/how_many_calories_do_jumping_jacks_burn_per_hour.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/konica_minolta_bizhub_c258_treiber.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/zotero_citing_reviews.pdfIn PDF document text
    • http://farevuzafi.rf.gd/15974556509.pdfIn PDF document text
    • http://dokufexazag.epizy.com/opera_internet_browser_free_for_pc.pdfIn PDF document text
    • http://lezebotetojezaz.epizy.com/frontline_commando_game_old_version.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_off0000ea78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA78 5096 bytes
SHA-256: fce31f4aa6239f0b164d6e0a917fc4a5bf8760da0616c1800b6ce728d905d8d1
font_01_sfnt_off0000fbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE1 11132 bytes
SHA-256: 9cd6686b3584a137852a19dc3cc9b80c270277ee19a4d3fdee56e006b3eff983

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