Malicious PDF — malware analysis report

Static analysis result for SHA-256 459f15e9ba750e1e…

MALICIOUS

PDF

77.6 KB Created: 2021-05-14 23:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c977d1e23246b30875e5765943a88afd SHA-1: 2059f2f6339daba04fea39e25425a7f969eaa3ae SHA-256: 459f15e9ba750e1ef03c644202ec72b6b12f0d75c3bfa5a120cb81e86eff21fc
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://lozipotod.ru/strik?utm_term=introduction+to+computer+system+class+11+pdf PDF link annotation
    • http://stankoff.org/binomische_formeln_bungen_schwernl903.pdfIn PDF document text
    • http://livemavuxedu.getenjoyment.net/cancer_stem_cells_review.pdfIn PDF document text
    • http://sijemogezabusa.sportsontheweb.net/pride_and_prejudice_2014_mini_series_watch_online_free.pdfIn PDF document text
    • http://hotsales-com.xyz/nekowaresibadiragugovtfj59.pdfIn PDF document text
    • http://fipizilemuwob.medianewsonline.com/gujarat_university_b._com_books_free_download.pdfIn PDF document text
    • http://aarbuz.space/mp_bsc_bed_application_form_2019ipac5.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://zugugalepew.mypressonline.com/how_to_do_a_voltage_drop_test_on_fuel_pump_relay.pdfIn PDF document text
    • http://zeboxagekej.sportsontheweb.net/simijogukodu.pdfIn PDF document text
    • http://poradoit2.site/how_to_play_chess_for_beginners_in_tamil2xglr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_3336ca000b394a179a85193139465923.pdf?index=trueIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_aa97c79cfe414d3291c06fe0733677be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/46625975-3e27-4ef6-bb70-915c4e497061/pedugitegisajetex.pdfIn PDF document text
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_458c2caad37a48128318ed7835863f0e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a63d3f9-43d5-4b1c-ae4e-d87a9ae39ee9/gavaruzubobipet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cfadb9b-8605-48af-bc2e-3d2b588a5a50/1999_ford_ranger_transmission_fluid_type.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99b52eb6-fe29-4678-a4fe-c293e2b9734a/how_to_convert_jpg_to_png_in_paint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c70a1639-0e75-492f-9a6c-3fcce33d08fc/company_safety_plan_for_construction.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/40617059582.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/why_is_glock_19_gen_4_being_discontinued.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e06db830-4291-4ab9-b416-2ea8915e851d/vupazesesafolonoxik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41f4c210-b7dd-4933-8f66-5f7829bf6a31/anti_deep_freeze_v_0.4_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f7909d7-5ea7-4b71-9a0b-f09118c8495e/how_to_turn_kidde_smoke_alarm_off.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_off0000eef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF7 5392 bytes
SHA-256: 05aa8775493d9a88bbbc3ef86bac28edc37ef9c0700a2624f96826bee69278ca
font_01_sfnt_off00010145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10145 11472 bytes
SHA-256: 9f0c907f5a9f385d84e628db0f33f3f6be962fc7e6e5ecf709ce37da58557c7b

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