Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7137a1d1b365133…

MALICIOUS

PDF

82.0 KB Created: 2021-05-12 12:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f467ad5a94da1398ecd5f754813f45be SHA-1: 112d1372ea5db7cab636db91099d0b10a378b503 SHA-256: e7137a1d1b36513318d1620d3ef8dd9217aa23c705185a6c1fd5aaf166ce682c
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The primary malicious URL identified is 'https://pelibifir.ru/strik?utm_term=gold%2527s+gym+xrs+20+olympic+workout+bench+stores', which is likely used to redirect users to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pelibifir.ru/strik?utm_term=gold%2527s+gym+xrs+20+olympic+workout+bench+stores PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470828/normal_60038fd8dd03a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411479/normal_5feaf1ca3237b.pdfIn PDF document text
    • http://kobivoweder.mypressonline.com/types_of_communication_system.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425917/normal_602628d8687ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379968/normal_6063513a69b12.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/jesus_bleibet_meine_freude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6578c2ac-afec-4f0b-adcb-a86136789870/christmas_carol_book_cover.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/singer_sewing_machine_free_motion_foot.pdfIn PDF document text
    • http://duxegejuw.atwebpages.com/euripides_medea_trke.pdfIn PDF document text
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_fdecdf57b8e246a8b4b6ab8bea169018.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fedure/ktet_result_2019_june_answer_key.pdfIn PDF document text
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_0bd3c561c6cd4ef29a63054167dfbf58.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f45f1361-654a-4c49-9efa-f38d32396ed0/statistics_and_probability_with_applications_-_teacher_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75847220-8f8c-41b6-9f39-9049f3ab83e1/79099185572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7e3a355-c9c5-44fd-804d-468f9140c2f8/what_is_moolah_shrine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ec0c24a-31ee-496f-96a0-2449b582b4ff/14275956340.pdfIn PDF document text
    • http://kenesowozowojaw.myartsonline.com/bestiary_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc9bd50d-bd7b-49d3-8e1f-e0769f6b808e/fugufuxotit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f604d4f-c98c-4d1d-9328-56417b13e6b5/can_acrylic_paint_be_used_on_canvas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/219cab30-885b-4bd5-8537-2d042e205d12/fefovomevepez.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/74767147790.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0e2599f-c223-457f-9ed9-1e8a553a139c/zaxigunuwalemil.pdfIn PDF document text
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_35e092b8cffd4da9872c408841b65270.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/34310e9f-f7c4-4cf9-a13d-2cdeea3857b2/84589691248.pdfIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_50ea2617397948d3a4c2a0d3f0ce3852.pdf?index=trueIn PDF document text
    • http://niwimugosaz.onlinewebshop.net/24947736460.pdfIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_4736fa4db88b4ae5932d88bfce2f0fc7.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_off0000fcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFD 6080 bytes
SHA-256: 88925f99434fcfa59a1cd0fd097a11edf1dd155e0978691c755de9171eb8ffd8
font_01_sfnt_off000111a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A6 12132 bytes
SHA-256: 77ccd3cc4411e38b385b2e65b3deaf542c417cc77fc90bd99168e4083ad9036a

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