Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d0ecb9529b0e9c1…

MALICIOUS

PDF

96.0 KB Created: 2021-03-25 00:23:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7a7666ca45137ed2a97bff62be03afe6 SHA-1: db018fac1af6bcb5d8a8a6adf22650b2e340aef1 SHA-256: 9d0ecb9529b0e9c1befa087bfcfea59368ab980bffac5feae6c4d25ea6448d4c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicative of a link farm. One of the primary URLs, 'https://zajinet.ru/strik?utm_term=what+is+a+ccna+certification+worth', is flagged as unknown reputation, suggesting a potential phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://zajinet.ru/strik?utm_term=what+is+a+ccna+certification+worth PDF link annotation
    • https://cdn.sqhk.co/rizikodeni/dgiGgp5/13913902915.pdfIn PDF document text
    • http://helpcenter.business/adobe_acrobat_7.0_standard_serial_number_crackch2mu.pdfIn PDF document text
    • https://cdn.sqhk.co/livatunozasu/cibXJif/runufepedakosoxikowifi.pdfIn PDF document text
    • http://unreguezff.rest/9217712833852igr.pdfIn PDF document text
    • http://instofficial.online/state_of_michigan_child_support_tablej68id.pdfIn PDF document text
    • http://blaugrana.ru/m_n_c_ki_full_formz4ggr.pdfIn PDF document text
    • http://ketrovk.xyz/fifosumadpkb7.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/2ifrpha/xuvuropexesa.pdfIn PDF document text
    • https://cdn.sqhk.co/woteruzid/cieEhcr/baby_alive_baby_grows_up_canada.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
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_400491bb31ea46abbc96872fece3d418.pdf?index=trueIn PDF document text
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_6f48a59252a045b88499ff4f370db84d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fedbc773-7345-4de6-a730-a67145940dd7/mini_weapons_of_mass_destruction.pdfIn PDF document text
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_ea1bcc0bfe984073bd02e5367d0a57d8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fcaef96-6d05-4718-a55c-03d9ef10fd5b/kyocera_e6560_battery.pdfIn PDF document text
    • https://b998fa74-583e-446a-a2a7-67f41460fdb2.filesusr.com/ugd/e081f8_9292c5df40be4ebca88dd7bf182fb68b.pdf?index=trueIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_b1bccca9eba343708c2d9bb6ad634377.pdf?index=trueIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_ffdca25b09ff4a79947728d8b1617d1f.pdf?index=trueIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_27b310f05a7b4784b8655c1d5089f7d3.pdf?index=trueIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_361f79e798814af6ba96c387de481d0f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fda83aa-8071-40e9-aa86-f2d5ced87f80/much_ado_about_nothing_act_4_scene_1_short_summary.pdfIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_bda8032ec8ee43ec93265cfe91d0ad9e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb8993ba-6d9e-43d3-96de-8a8eb270b001/how_to_unlock_hoveround_mpv5_controller.pdfIn PDF document text
    • https://6f1239e7-da96-47bf-8adb-22d47a96a9da.filesusr.com/ugd/bb5a15_1e37f913bd844dacbec2f6ca30d2e32f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/432eb8e5-954c-4fc9-9f69-577dd0817eac/craftsman_6.0_hp_lawn_mower_spark_plug.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_off00012d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D62 4828 bytes
SHA-256: ef0c0823244ecc623c9af1b79142788fba9095056bf5b98570079b20ecd1911e
font_01_sfnt_off00013dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC7 11336 bytes
SHA-256: 176d458c084ad894dd92c75a0e26e0c7f38cc76fad9d88b0edf60732b821eaad
font_02_sfnt_off00016454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16454 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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