Malicious PDF — malware analysis report

Static analysis result for SHA-256 1127917368439c86…

MALICIOUS

PDF

78.6 KB Created: 2021-04-08 07:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 065df9e3676c153cc40cbcaeadc17466 SHA-1: b1c9a7aba9c08af3b4938a2330bac76b0bf5cb3e SHA-256: 1127917368439c86f2cc25959e97ed191afcdee0cf0f669adac586b9c9432344
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://fokemale.ru/strik?utm_term=what+is+the+plot+of+noughts+and+crosses PDF link annotation
    • https://ranenowubugipo.weebly.com/uploads/1/3/4/0/134040983/sijixetal.pdfIn PDF document text
    • http://xejelofewi.mygamesonline.org/biological_soil_conservation.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/ludodigix.pdfIn PDF document text
    • https://dapavivilo.weebly.com/uploads/1/3/4/8/134895477/wiliwarirepub_goxanajif_mesiwuxufexusi.pdfIn PDF document text
    • http://gibelineg.sportsontheweb.net/13888813881.pdfIn PDF document text
    • http://rasezatoxefu.mygamesonline.org/bewexixabinovetof.pdfIn PDF document text
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/80dd8bee2b57b2b.pdfIn PDF document text
    • https://feraresafobigim.weebly.com/uploads/1/3/0/8/130813798/fefod-bavugapewo-pojetol.pdfIn PDF document text
    • https://pofemazavuson.weebly.com/uploads/1/3/2/3/132303373/e9e326e0f60.pdfIn PDF document text
    • https://rimenedefogifu.weebly.com/uploads/1/3/4/4/134466040/sukozude.pdfIn PDF document text
    • https://xejotonevuxujuj.weebly.com/uploads/1/3/1/3/131379732/gowefurosoxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/aee77f3d-914d-41aa-9a22-07207effc8c8/simulation_with_arena_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bc05f65-3e3a-426b-b541-d96da4d48cdc/bugipugisagiwanij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fc48d05-394e-48e6-95e0-1f78bb68e30c/how_much_do_criminal_defense_attorneys_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de8294c0-e084-4c3e-a6a6-c657695292b2/windows_7_ultimate_service_pack_1_download_64_bit_torrent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5460582-c689-4e4c-b97b-66fd8d2661ed/momowomexurozikebinobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed353c7c-ee0c-4bdd-8f63-065a4c5f908c/most_dangerous_part_of_new_york_state.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eb83425-4163-42ae-9f8c-793e091b9ac9/fatigue_stress_concentration_factor_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca6e9bbd-c79f-4b80-9376-3d0d6e0aceab/how_to_relieve_constipation_and_bloating.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1af44678-7d09-451f-8ba8-ab219cd61e62/sears_chainsaw_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8495c512-fe49-46c4-9854-426596fd84bc/masimo_radical_7_pulse_oximeter_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18b0cd08-7ca9-4b34-9288-f4716ffdf42c/is_agile_always_better_than_waterfall.pdfIn PDF document text
    • http://vafitinupisojud.onlinewebshop.net/46132872301.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_off0000f359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF359 5432 bytes
SHA-256: d694289e45d9414a93dd2d8687a2b539b4510bbe7372db93846ef46f8859258a
font_01_sfnt_off000105de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DE 10956 bytes
SHA-256: 05946ce1927fb4506f2c3d2906d69cede85d9643a9bdf3562c8566ddb69f3070