Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cea823454ea6caa…

MALICIOUS

PDF

80.7 KB Created: 2021-03-24 18:16:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f3848ef8711fd743968564b9664d8700 SHA-1: deb5e3d9022840a54d8fdc119b38c7379d525c94 SHA-256: 8cea823454ea6caa0ebefb7c3e3dd50dc15dfa18e92dd60ae980ee010aae73cc
184 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure the user to a malicious site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=barcode+pdf417+generator+online In PDF document text
    • https://cdn.sqhk.co/wakivugex/eC185OQ/free_antivirus_software_download_for_windows_8._1.pdfIn PDF document text
    • http://eu-study.ru/how_are_folk_and_pop_culture_similarenpri.pdfIn PDF document text
    • http://discount50.pro/dometic_rv_ac_cover7hxk6.pdfIn PDF document text
    • https://cdn.sqhk.co/nexasolonit/jaex4hg/draw_it_all_out_skin_detoxifying_mask.pdfIn PDF document text
    • http://osmosiotzs.fun/ambulance_driver_handbook_californiaqufza.pdfIn PDF document text
    • http://devicesprotectionforusers.site/apc_smart-ups_1500_rm_2u_lcd_100vo761l.pdfIn PDF document text
    • http://idealicaitalia.website/sony_alarm_clock_radio_cd_playermn5g4.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/dudurat/57275727102.pdfIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_82d9e55b796a4c3e8ec5041d4834705f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d4b630f-fa74-40c6-8088-2e3d4afec347/62572108913.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/how_many_pedals_can_voodoo_lab_power.pdfIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_ea5b8c6152ce4103ab2d34b7e405fe19.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/27adacaa-a9b4-4ed3-8179-51ca632b8b41/70566185838.pdfIn PDF document text
    • https://f7690f66-1871-4559-97e0-239dee5b15da.filesusr.com/ugd/d2cc1f_f02db7bbad1949a8873fffa9d9976ae4.pdf?index=trueIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_8718741356f8441584ba86899250b93e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/25516076527.pdfIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_6257b5dce5a14c95bc9a72b69f475678.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3a2ef6e-8bfd-4db1-b07e-49759abb246d/hamilton_beach_digital_sure-crisp_air_fryer_toaster_oven_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c94261b-fce1-4531-b2c0-9f2c3a5ec7d1/computer_does_not_turn_on_after_power_outage.pdfIn PDF document text
    • https://de2ee6d5-caaa-4265-b15c-40100ab77d99.filesusr.com/ugd/d43733_26cfd3bc873b4d4187bfa28ad7f3b5dd.pdf?index=trueIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_e0537c3283c34e66a345befd2af1a20b.pdf?index=trueIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_ec19e120e213480c8902c29c1328a731.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b923e40-6b74-4110-bf60-02f807702957/81111009662.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_off0000fd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD21 5412 bytes
SHA-256: 73c93acfcfe26468d793d8d19727c7e119bd5ccab00f85d788210db758ac3147
font_01_sfnt_off00010fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAD 10992 bytes
SHA-256: ef6f15ab2b8aef8740c9d629641e204ea596e2507426415fcde0de1a105eb102

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