Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb8044f9b8d7db8…

MALICIOUS

PDF

81.3 KB Created: 2021-05-05 21:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c5368d1fcfc26fe6dccf3e1f2064912b SHA-1: 1590229999146240daa2e5150e4580fd5c733b23 SHA-256: 8eb8044f9b8d7db8bb21361a3a89ad7997c5310f542468b1487afab27bd1ea4d
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 0.9992

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://botokaw.ru/strik?utm_term=sennheiser+ew+100+g4-ci1+wireless+guitar+system PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499935/normal_604660b9e6508.pdfIn PDF document text
    • http://xufuzema.sportsontheweb.net/alimentos_ricos_en_fibra_dietetica.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375531/normal_6025fa717091b.pdfIn PDF document text
    • https://sugelazo.weebly.com/uploads/1/3/4/7/134767002/8522219.pdfIn PDF document text
    • http://nebatomefov.scienceontheweb.net/mix_design_ratio.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/liwuvolilebubolupilalifo.pdfIn PDF document text
    • https://lobepujijas.weebly.com/uploads/1/3/5/9/135966441/6787623.pdfIn PDF document text
    • https://tedalemom.weebly.com/uploads/1/3/5/3/135398197/gufabibelebe_mipefeke_suvamujore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473919/normal_603efdbf0e2fc.pdfIn PDF document text
    • http://pexawegowe.mywebcommunity.org/ikea_pax_wardrobe_instructions.pdfIn PDF document text
    • http://ziwigosopijulal.mygamesonline.org/can_cricut_expression_connect_to_computer.pdfIn PDF document text
    • https://mogudigadoto.weebly.com/uploads/1/3/2/6/132695399/kumijefipupojifase.pdfIn PDF document text
    • http://texoraw.sportsontheweb.net/37500173226.pdfIn PDF document text
    • https://podetixado.weebly.com/uploads/1/3/0/7/130739559/f323b0802.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rususekobijo.myartsonline.com/aromaticity_antiaromaticity_non_aromaticity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c59b7835-df8f-4bc9-acd4-419b1c383921/are_beats_studio_3_better_than_solo_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d1c54f7-b493-4d8b-b3d4-5c0df414027d/what_meats_can_you_eat_on_an_alkaline_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48e1ea44-1b9c-4095-af68-2d76cfaba409/temafun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8ef5447-494b-485d-a188-d37be0a55992/echo_cs-400_vs_stihl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59086dc6-1ca0-4f3b-bca1-877769bcca75/wotosujasijorezizedase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e9ffbed-5eb4-4bc9-999c-2977d228062b/price_action_strategy_for_scalping.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66c5d883-4e3c-4d4c-8acc-63de41d21312/short_moral_stories_in_hindi_for_class_7_with_pictures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9973abd2-038a-4ecd-bdfd-3fcb57ad90b9/40052687716.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1D 5596 bytes
SHA-256: 914654fcda5ee3765cc1d5b7ccbf8378a1c75a1a0e4a0a6251860c720243e041
font_01_sfnt_off0001021b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021B 11576 bytes
SHA-256: 71c9c364004dcbf94b9ec4a729876811507a1031a95933d83ec771d0dae816d5
font_02_sfnt_off0001297f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378