Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e55e19cbff76f2…

MALICIOUS

PDF

78.2 KB Created: 2021-03-06 09:54:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 280050e18b2af8eb4438abaeda0c40d6 SHA-1: 8cfc51c19f3742c1e0820f961a47ce30e873da6f SHA-256: 87e55e19cbff76f2921d6c4550aceb0b98e501c9c2a0e1c7f97f74fff87264df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The 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 one heuristic identifying it as a link farm hosted on disposable infrastructure. The primary purpose appears to be directing users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/123?utm_term=forgotten+realms+ruins+of+myth+drannor+pdf PDF link annotation
    • http://onatural.space/biogeochemical_cycles_answer_key8t8ik.pdfIn PDF document text
    • https://cdn.sqhk.co/luvunugoz/Od1ooib/gakewe.pdfIn PDF document text
    • http://romeoplanet.club/28686494212ri93n.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/NfsWyjc/troy_bilt_pressure_washer_pump_parts_diagram.pdfIn PDF document text
    • http://dvertsoff.ru/mecanica_vectorial_para_ingenieros_dinamica_9na_ediciondo3cw.pdfIn PDF document text
    • http://jadebey-x.com/french_childrens_books_to_read_onlinespfdf.pdfIn PDF document text
    • https://cdn.sqhk.co/patemugimej/0fhgzjd/zedd_girlfriend_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/xiruregexibe/qPxhbge/majigagu.pdfIn PDF document text
    • https://cdn.sqhk.co/jojevirelo/Jiiwoje/temple_run_2_online_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/bEXihBf/gemebexuliluwubenalu.pdfIn PDF document text
    • http://bloodcraft.online/neural_network_projects_with_python_downloaddesuk.pdfIn PDF document text
    • https://cdn.sqhk.co/rotexopapi/GIBPijZ/different_police_siren_sound_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tarudifirew/dzghfjg/limbo_video_game_walkthrough.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bemisiba.epizy.com/ibm_app_connect_enterprise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2284901d-2b72-45ac-81c5-9ea2cfbd6621/how_to_update_grub_config.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f858b06-45c1-4709-ba8b-81e72cb8f317/los_juegos_del_hambre_pelicula_completa_espaol_castellano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5acf945-e697-415e-9c15-9947a1906811/2077059367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fa4d488-1c35-4c18-9f6d-ddf69a14a095/wisorivokajumigorula.pdfIn PDF document text
    • http://rekefapurepe.epizy.com/40894424854.pdfIn PDF document text
    • http://filazit.epizy.com/optiplex_755_cmos_battery_replacement.pdfIn PDF document text
    • http://rizolejebogu.epizy.com/3197985418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca32995a-3c66-4049-befb-16b07b8afecc/what_is_the_solubility_of_nh4cl_at_50c_per_minute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6b53f4a-d697-4dab-943f-d383f036c95b/why_is_the_picture_on_my_samsung_tv_dark.pdfIn PDF document text
    • http://kimogule.epizy.com/whatsapp_gold_apk_5._5_free.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_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 5512 bytes
SHA-256: a9c56be49e01318372f4f40156a9805b9fae457a7770f54db5a4b6367d46dec2
font_01_sfnt_off00010495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10495 11156 bytes
SHA-256: ce4e92fcd0069e5a8d197691b235e7d56f0a863370f7ac1f0436835f22b8bb78