Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d851b595186694…

MALICIOUS

PDF

100.1 KB Created: 2021-03-28 15:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fbf7ad57ba4a7cbb4e701b89466b5a61 SHA-1: 53e357f4531304a5f960756c8b9c9f73803d782c SHA-256: f7d851b595186694c4939eda01aeb42485142450b32df1d9ee6894f9a824f40d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and configured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=el+principe+de+la+niebla+carlos+ruiz+zafon+personajes PDF link annotation
    • https://cdn.sqhk.co/xafeperale/age5TEz/pinball_arcade_games_free.pdfIn PDF document text
    • http://repizedozoful.sportsontheweb.net/buku_akuntansi_dasar_smk_kelas_x_kurikulum_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/wejagamewo/0ABhc3j/pac_man_fever_ps2_cheats.pdfIn PDF document text
    • http://wiforopevubane.22web.org/moment_timezone_24_hour_format.pdfIn PDF document text
    • https://cdn.sqhk.co/jupujezaxa/Nrif8mF/science_lab_table_clipart.pdfIn PDF document text
    • http://jonebukusopovet.mygamesonline.org/handbook_of_drug_metabolism.pdfIn PDF document text
    • https://cdn.sqhk.co/salipini/hsjjigg/sovoxomemofaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420431/normal_5fd22753b433d.pdfIn PDF document text
    • https://cdn.sqhk.co/peferitukofa/6jjjiBS/history_of_religion_in_south_africa.pdfIn PDF document text
    • https://cdn.sqhk.co/mitukutowum/cRezjdx/company_of_heroes_2_steam_api._dll.pdfIn PDF document text
    • https://cdn.sqhk.co/bopopujag/hjiWigc/pac_man_world_20th_anniversary_download_pc.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/sociology_textbook_class_12.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gimisorixosu/autocad_practice_drawings_for_civil.pdfIn PDF document text
    • http://puxedevonizu.epizy.com/79730559557.pdfIn PDF document text
    • http://kipazafar.atwebpages.com/tom_clancys_jack_ryan_season_1_episode_5_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/punjabi_bass_boosted_app.pdfIn PDF document text
    • http://nomamazuzut.atwebpages.com/fofit.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/how_much_does_lawn_mower_repair_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/kutty_movies_2019_isaimini.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D46 5172 bytes
SHA-256: ee8f0072cb4561a5b3a97304e06e2c56733ac2b3f03811f5080f577fc477da1f
font_01_sfnt_off00014edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EDD 11576 bytes
SHA-256: 34e73a6bdc872d06b8bf7080872deb22f72368d748b3cfab7bddc9db25cbf62e
font_02_sfnt_off000174dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174DC 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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