Malicious PDF — malware analysis report

Static analysis result for SHA-256 74e0d2e4dfe47865…

MALICIOUS

PDF

81.3 KB Created: 2021-04-08 07:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ca514d375c9a2ed0c82bf2737f4b84f8 SHA-1: 985d0d7bebace9b0591d596357e5d014f6611076 SHA-256: 74e0d2e4dfe478658ff99de35ffa8066cdaebf29070634292f07a427f2ad4734
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 0.9967

Heuristics 6

  • 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 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://druttle.ru/123?utm_term=zte+axon+7+review+android+authority PDF link annotation
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn.sqhk.co/terodekijur/BzgcJje/screen_recorder_windows_10_not_game_bar.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/jcjjiMq/tiwevudumaxaxi.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolefowi/dDaOgiw/pezifewasafoxezu.pdfIn PDF document text
    • http://pogadai.xyz/vobefifefupaxataluwomufahz4yn.pdfIn PDF document text
    • https://cdn.sqhk.co/lilodipu/0M3Uict/assistir_furia_de_titas_1981_dublado.pdfIn PDF document text
    • https://cdn.sqhk.co/terisuzuji/8D71hd6/51573867850.pdfIn PDF document text
    • http://reduslim-shop.website/tda_mmd_models6ownk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_c5b6fc88b2ee441995ae2a2d273643a7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f0158dd-1f97-411c-a813-3cc4d4f69252/phillies_schedule_2019_tickets.pdfIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_fcc8cc3ad8984cba9ac6bf91be36079e.pdf?index=trueIn PDF document text
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_88083625bd864e95a759dae2c48d8837.pdf?index=trueIn PDF document text
    • http://fexotupakel.rf.gd/escort_passport_9500ix_will_not_turn_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bb8ce02-f214-4d78-8f77-f7851d06f1dc/what_you_eat_is_your_business_summary_and_response.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80330fd9-5f0a-4b48-a628-ab8ecbe4b343/39166304668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0507b2d8-9e38-4242-a8ca-481b37329330/why_my_maytag_dishwasher_wont_start.pdfIn PDF document text
    • https://4407eba0-147d-4e9d-98ff-19010b67f466.filesusr.com/ugd/c1f2fd_676c28a95ce54fccae5f45501c3ded68.pdf?index=trueIn PDF document text
    • http://fajukowopod.epizy.com/81921986111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52814568-5659-44b6-8f4a-15fe6ee05701/84712516763.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f9b7049-371f-4671-bb94-3a180433ad95/24649867642.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79bc2ce2-26b0-4be2-a945-0309cb54f12e/top_down_vs_bottom_up_approach_in_network_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bd8e26e-ec18-486e-b2d8-375d11f670d9/asus_rampage_iv_extreme_bios_reset.pdfIn PDF document text
    • http://paviremepofuvu.epizy.com/book_of_mormon_online.pdfIn PDF document text
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_eb193ee6f5d94a308f36c69c70451a9d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/594cde35-7019-4786-8547-df3b9fca7641/toro_power_clear_721_qze_wont_start.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e26373f7-c9b2-4a1c-a865-999eb5816c38/1050-15_stanley_garage_door_opener_remote_control_transmitter.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_off00010093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10093 5060 bytes
SHA-256: a825819f09e68db485e12352f2d618737cb15bb0e670181cdf8a077576ba6aa1
font_01_sfnt_off000111e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E7 10920 bytes
SHA-256: 2e2cf5e6ed384755ebeea6601f6a0d4b131f40850ecaa8665b8aba6ea2372d59