Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cdb8091ffc5ba91…

MALICIOUS

PDF

79.6 KB Created: 2021-03-04 17:48:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: e1298225a1c766dfc2b1212193060c53 SHA-1: 3368cd77650f1c07547e70c680828edf03efb871 SHA-256: 1cdb8091ffc5ba91d2fd2c31508b5fcf8995e6cc8c9b745c0d629adc49bb056a
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure strongly suggest an attempt to deliver a secondary payload or phish for credentials.

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://bologen.ru/award?keyword=four+directions+of+medicine+wheel PDF link annotation
    • https://cdn.sqhk.co/govuzupikiwe/didhaig/township_and_range_search.pdfIn PDF document text
    • http://vozuzutiwajuzip.getenjoyment.net/a_random_walk_down_wall_street_summary.pdfIn PDF document text
    • http://tajumizigareni.iblogger.org/crosley_record_player_review_urban_outfitters.pdfIn PDF document text
    • http://tejowigasinafu.getenjoyment.net/linear_inequalities_worksheet_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/gitopedevid/jaYAhdL/free_slots_games_downloads_offline.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384316/normal_601ba77491066.pdfIn PDF document text
    • https://cdn.sqhk.co/fomeluxilim/CrhgQyF/38382663305.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389106/normal_603ecf6068b69.pdfIn PDF document text
    • https://cdn.sqhk.co/fowizolomam/hhgjjZd/pregnant_swordtail_fish_giving_birth.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vesuduw.epizy.com/face_360_porvorim.pdfIn PDF document text
    • http://wefebasutij.epizy.com/69957150945.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20ccf705-7437-4121-bc0e-332836eb622a/microsoft_flight_simulator_x_deluxe_demo_download.pdfIn PDF document text
    • http://kafuxuf.epizy.com/python_programming_sample_projects.pdfIn PDF document text
    • http://mazizinopuki.rf.gd/the_river_cafe_new_york_menu_prices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6973883c-83db-4029-9c06-ef62962542c2/beruropepufi.pdfIn PDF document text
    • http://vekisofekibote.myartsonline.com/how_does_text_structure_impact_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9984123a-ff25-4681-aaee-a3539680a485/10965891663.pdfIn PDF document text
    • http://lerofisa.epizy.com/abstract_reasoning_test_free.pdfIn PDF document text
    • http://gexepitirunagu.rf.gd/88653212655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70f8f82e-f7e0-4cfd-bdd4-ccc8611607bb/how_to_interior_design_my_own_house.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_off0000fc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC75 5096 bytes
SHA-256: 781bf7e2e1b03a810814e2c9011b94e5660bc9b97e8de8dc07296eec58658144
font_01_sfnt_off00010db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB6 10196 bytes
SHA-256: ee61b0b0a51faf5efd332baf085e3bac3b2bd91c784b1c320630c964dd6eaedf

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