Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d2f9bb8b966807…

MALICIOUS

PDF

121.2 KB Created: 2021-03-29 19:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb5bafb31fe1a369e3ebc07e3c18cbb9 SHA-1: 60dcf8ee7f28bd4d380c575b47757222bc7649b5 SHA-256: 50d2f9bb8b9668073c3c5d7d9fabe884b0b721e3631431a93c64cf43a3366649
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to seemingly random PDF files, indicating a link farm or SEO manipulation tactic. One embedded URI, 'https://kuzutuzo.ru/wix?keyword=flying+fish+from+mario', is particularly suspicious. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to drive traffic or potentially host malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/wix?keyword=flying+fish+from+mario
    • http://bcpzonasegurape2-viabcp.com/thrawn_trilogy_canon016i2.pdf
    • https://rixukiwifezi.weebly.com/uploads/1/3/5/3/135392959/bofotofu.pdf
    • http://boomua.site/dialectica_de_la_ilustracion_resa3qpe.pdf
    • http://mnclassis.org/the_balisong_capital_of_the_philippinestcscr.pdf
    • http://mifvideo.space/segment_routing_part_2tqk1x.pdf
    • https://mizunilido.weebly.com/uploads/1/3/4/3/134352057/aad59.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wolina/psychedelic_furs_ghost_in_you_sheet_music.pdf
    • https://s3.amazonaws.com/besafefaf/acceptable_forms_of_id_uk_alcohol.pdf
    • https://s3.amazonaws.com/zumezeviwakiz/american_journey_textbook_7th_edition.pdf
    • https://uploads.strikinglycdn.com/files/46406be2-f849-40d1-9225-021023df0138/how_to_become_a_black_belt_in_judo.pdf
    • https://s3.amazonaws.com/fekazudabo/piriformis_muscle_pain_location.pdf
    • https://uploads.strikinglycdn.com/files/1b2b1e67-8248-40d5-9950-8d00cb1b96f5/how_to_configure_a_zyxel_router.pdf
    • https://uploads.strikinglycdn.com/files/bd855880-1458-438b-bd35-1d66685b9034/pioneer_avh-x3600bhs_bluetooth_memory_full.pdf
    • https://uploads.strikinglycdn.com/files/01ad35ac-dd8b-49d0-87e9-f07209825535/graco_literider_travel_system_lx_with_snugride_click_connect_30.pdf
    • https://uploads.strikinglycdn.com/files/54b2af39-355d-4936-85df-bbd9fc3513dd/jayco_owners_support.pdf
    • https://uploads.strikinglycdn.com/files/c0ab6573-8b91-4077-a7cc-fee85a9120ec/dell_optiplex_7010_sff_pcie_slots.pdf
    • https://s3.amazonaws.com/rovikibixu/how_to_breed_mini_dachshunds.pdf
    • https://s3.amazonaws.com/zedilegol/why_is_there_no_pressure_in_my_karcher.pdf
    • https://uploads.strikinglycdn.com/files/a7055696-d17c-469f-a8a3-77de75473c16/weider_ultimate_body_works_incline_bench_video.pdf
    • https://uploads.strikinglycdn.com/files/b1764c7b-f70e-44b5-b061-8dcd0dceadb1/honda_civic_type_s_2007_engine_oil.pdf
    • https://s3.amazonaws.com/janodojivi/66158184710.pdf
    • https://uploads.strikinglycdn.com/files/4b31e98b-7000-4fd2-8b80-f39353924c27/how_to_turn_on_sportdog_shock_collar.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016a90.bin
a216672cee5c7d858222c88b9019c1ab14c8d7c7094024134385e0404d6e84c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A90 11164 bytes
font_01_sfnt_off00018fce.bin
5e8fdc179b25edc3988ff4fcbe579585466a696bc91d1fa8f7e67b910ee0fa7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18FCE 4828 bytes
font_02_sfnt_off00019ff7.bin
d787da8fb2ae70453381e3bc496c0f29a3be61ea09486f2fc045e2b07fcd5dfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19FF7 12308 bytes
font_03_sfnt_off0001c8aa.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8AA 4324 bytes

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