Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1138639f7f38851…

MALICIOUS

PDF

75.7 KB Created: 2021-03-08 22:22:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73c01f5c270217c75544e553fd349419 SHA-1: d36755af44c410f832a792c4f435a2113f0d2189 SHA-256: f1138639f7f388510dda8d679666ea92e4ee9efe615a7cecb4334f7262c1c5ab
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to contain keywords related to the embedded URLs, suggesting a lure to trick users into visiting these sites. The presence of external URIs and the link farm heuristic indicate a strong intent to redirect users to potentially harmful 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://botokaw.ru/123?utm_term=guide+dog+meaning+in+telugu
    • http://bomisedoxu.mywebcommunity.org/omron_step_counter_hj-321_pedometer.pdf
    • http://jakusavu.sportsontheweb.net/how_to_disassemble_polaris_backup_valve.pdf
    • http://fisareboveda.getenjoyment.net/93763244812.pdf
    • https://cdn.sqhk.co/wefegiwezon/xJCihij/tujefaxavo.pdf
    • https://cdn.sqhk.co/wibetaxor/gqxtgc3/formula_car_race_speed_drift_chase_mod_apk.pdf
    • http://nebemor.mywebcommunity.org/how_to_cite_a_website_harvard.pdf
    • http://maxobujixeweden.sportsontheweb.net/us_history_timeline_1600s.pdf
    • https://cdn.sqhk.co/fuvebopeweb/jfIj9gh/stuntman._io_bike_stunt_racer.pdf
    • https://cdn.sqhk.co/govizanorev/FgjFsxp/pevodijuretirasunufeziwam.pdf
    • http://lobulezinovux.medianewsonline.com/wearever_pressure_cooker_seal.pdf
    • http://faripofijukevom.mywebcommunity.org/yamaha_ns10m_studio_vs_hs8.pdf
    • http://najetaxu.mygamesonline.org/ice_maker_not_filling_with_water_maytag.pdf
    • http://milesatel.mygamesonline.org/your_grace_is_enough_lyrics_and_chords_key_of_e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_4cd3d25f490d411dabe2dba334d85191.pdf?index=true
    • http://nivuzujanux.myartsonline.com/business_communication_definition_by_different_authors.pdf
    • http://wewamamewiler.atwebpages.com/mapamundi_con_nombres_para_imprimir_blanco_y_negro.pdf
    • http://mipagolawalixa.onlinewebshop.net/ver_diarios_de_motocicleta_espaol_latino.pdf
    • https://b03e51a8-7171-48c0-94d6-e4c032e6f37f.filesusr.com/ugd/9421c8_16352e6d29ac46bc9783fb7033635945.pdf?index=true
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_b7b5985a3e3948caa29166b042ceb870.pdf?index=true
    • https://ee67c5b3-b4d3-4257-b425-af55881d3a68.filesusr.com/ugd/c60da7_ac851a5597c34a54a451db112d431d42.pdf?index=true
    • http://gemovimuwopete.atwebpages.com/monaviridoverukemob.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed5b.bin
ed8c6546ac8f206791cef0458fc795df3abb3e34da8f5625f7e3f8b3737cf6fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED5B 4900 bytes
font_01_sfnt_off0000fdf7.bin
64389b4ff29b04005661f479b7ee99c846911925fc14ee9738dc33f5bbbf857d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF7 10576 bytes

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