Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff1508efd3c3600…

MALICIOUS

PDF

79.3 KB Created: 2021-03-27 21:42:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a87ce3d22e32cf353e78a7b94459430c SHA-1: 58fe33d6d5e356dc5b4be00e2751b5caf7ab4d1b SHA-256: 6ff1508efd3c3600a140a419790000242584ba0d3bd0f55aded00366701efa9d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://druttle.ru/aws?utm_term=how+to+hook+up+logitech+z506+to+computer PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462993/normal_5fcdfa4426985.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370985/normal_6033cab8ad6a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366400/normal_5fff92f21e210.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408871/normal_5febbfb8993c6.pdfIn PDF document text
    • http://baranaydin.org/alif_se_full_hd1080p_video_songyqqn8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417662/normal_600d55297a76c.pdfIn PDF document text
    • http://usecabinets.xyz/air_force_1_high_top_with_strapjag9w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_7ba161b158854342ad450f50405fb41b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bojafazes/satobabumefenunumofomoma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfe052f8-a641-4091-a423-f4fd2c7be40d/how_to_fix_ac_leaking_water_inside.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/avakin_life_pc_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/formato_de_asientos_de_diario_para_imprimir.pdfIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_871ec05a69ad4e89865ebd5332b94409.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/memexelu/beethoven_virus_passion_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/dell_precision_m4600_windows_7_driver_cab.pdfIn PDF document text
    • https://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_6a898f83c1b3405ba39c5ec90b97256f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rirusozo/excel_spreadsheet_for_financial_statement.pdfIn PDF document text
    • https://39dd5e1d-a581-41ec-a80f-9e19245c660f.filesusr.com/ugd/c2656d_d0f8d9197b8647d5b04d3e48cf6269b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5f6bb3c-114a-455e-964f-26a45f572807/new_yorker_hotel_email_address.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65a60834-527a-4ad9-832d-30ad62b06e9f/un_mundo_feliz_serie_imdb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caaa6457-ae06-41ac-9604-000759bb8bef/balancing_equations_worksheet_answer_key_physical_science_if8767.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f19d6e91-2eea-4912-a7d5-bb9fa46bce95/76793348507.pdfIn PDF document text
    • https://6b2f37ea-3696-4b87-858b-663c379f6f6f.filesusr.com/ugd/16879a_a7a27ee1ccd04acf9a139cc1b3198d39.pdf?index=trueIn 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_off0000f651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF651 5544 bytes
SHA-256: a63edccfe069280a3bc65cb297964feb1757a8f1d5887e114b63816db6a327f0
font_01_sfnt_off0001092f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092F 11212 bytes
SHA-256: 96648e204c5e47be3910c9cb4acac2dbc4d562ca173dc9395779e489d124b876