Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e130b28f6c399e…

MALICIOUS

PDF

70.5 KB Created: 2021-06-06 22:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a7c0a70868cdad5db00f1c495e89a412 SHA-1: d399350d6feb932158e8e022aa4912a7957c8d56 SHA-256: 86e130b28f6c399e7b1b2edfbae63349918e05bc26a5641e463f082aade88df2
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier indicate malicious intent, with the 'Pdf.Phishing.Trojan' signature suggesting a phishing or trojan distribution role. While no scripts were directly extracted, the PDF structure and external links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/123?utm_term=all-+stars+racing+transformed PDF link annotation
    • https://mubikopupisuf.weebly.com/uploads/1/3/4/7/134711770/puvabebevo-mekazu-fokunimunafede.pdfIn PDF document text
    • https://sadaxolofomet.weebly.com/uploads/1/3/1/4/131453623/ae43128a505854c.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/0ac28c1d-bd39-4078-89db-0f6ad26c6673/davinci_resolve_17_tutorial_italiano.pdfIn PDF document text
    • http://dawanitapix.pbworks.com/f/how_to_write_ielts_writing_task_2_agree_disagree.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e3fab0e-6c9e-4e51-9261-8f18601967e8/tejazaketizetoxazeti.pdfIn PDF document text
    • http://siruzosu.pbworks.com/f/papalia_desarrollo_humano_13_edicin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10c6ae15-eb77-4a56-ac80-8f4b5949053a/percy_jackson_movies_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5510ff0b-a833-4c65-a6b8-9ffd77161be4/5076618558.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd48accf-7db0-4b1a-b923-aea60c86570a/los_generales_de_dios_john_g_lake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/954618e4-5c98-4989-832b-ecf0e047552c/how_much_do_psychologist_make_in_nigeria.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/f/kurey_sresi_tefsiri_mumsema.pdfIn PDF document text
    • http://paditoxef.pbworks.com/f/is_john_wick_streaming_anywhere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8169934-bde0-4ea7-81c0-26ef747783f5/survival_kit_backpack_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0753a87e-b878-4549-aeb4-6b36acdfa587/48375800342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cfd958e-6b52-48f4-a511-d3e842c9b591/57386203494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3ca235d-e31d-4241-bb02-42eb166a5a0d/12693529874.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12311713-61fe-487e-ad5e-8cdad4b4e76a/how_to_pack_minuteman_hose_load.pdfIn PDF document text
    • http://fulusivijomu.pbworks.com/w/file/fetch/144557100/how_to_use_universal_ac_remote_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1260a8d-69ad-4ea6-88e2-15121eb9036b/65027260149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/784480cf-7824-4cdc-a0db-106bcde57872/gifeduzafegaxukadinufox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c96f065c-0125-4640-b2b1-df072a49f938/anet_a8_plus_cura_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b541a696-4a25-425f-9570-6377d3882986/dd_monster_manual_3.5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dd31f24-f7de-4229-980a-914d331e2fc9/29575013080.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_off0000d012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD012 5364 bytes
SHA-256: a62d60faee897f19afa2d1c4f452e3b849a449f031d1a6811d0be8ae1bfc346b
font_01_sfnt_off0000e23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23A 13940 bytes
SHA-256: 317ad9ad4de04b577751997e76634ea22aef5ad926b6e9af2ce1d2700d6a2dae