Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c5461a687e7952…

MALICIOUS

PDF

73.2 KB Created: 2021-06-05 21:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7d2d5af5c61689df7e5c34e1363b45be SHA-1: 208a2bc7f4b8d5fc5c6378c110aad00873289dff SHA-256: f2c5461a687e79523ccaa90f8e05ae77b36a46dc2aeaf9786c488627e414c773
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant number pointing to disposable hosting and employing UTM parameters, indicative of a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://krisoc.ru/pbw?utm_term=onkyo+cr-325+with+bose+speakers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374207/normal_60541dbebfbd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445871/normal_5fdc54fceb396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380084/normal_601ef1372bac9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385214/normal_5fcf280da16e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403140/normal_5fc5ca3cdb3b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446399/normal_602cf2ec6ec03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468831/normal_5fe74d090c9d9.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4489045/normal_60b2778a2217a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gediripu.pbworks.com/f/how_to_increase_tiktok_likes_and_followers_2020.pdfIn PDF document text
    • http://zufiwuz.pbworks.com/f/juzalanaxabiti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/542aec70-b798-44d8-9564-81666588277e/who_is_most_likely_suicidal_and_should_seek_help_brainly.pdfIn PDF document text
    • http://wenitat.pbworks.com/f/examples_of_irony_in_to_kill_a_mockingbird_with_page_numbers.pdfIn PDF document text
    • http://bezagodo.pbworks.com/f/employee_retention_rate_excel_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88a67177-3c86-4163-bc70-623e5897ee8a/2237938004.pdfIn PDF document text
    • http://lomexalipele.pbworks.com/w/file/fetch/144506886/30558820065.pdfIn PDF document text
    • http://gipomebepate.pbworks.com/f/82736329917.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ec7ae14-69ce-438c-abf7-eca385636112/how_to_install_canon_printer_without_cd_on_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4da5fd8c-925d-4536-b424-c96011ce246b/what_are_the_three_rules_for_writing_scientific_names.pdfIn PDF document text
    • http://foxobekizax.pbworks.com/w/file/fetch/144437550/carte_catacombes_paris.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b915b62e-8098-4cb1-a44d-325f563ca0a0/tiwabadoma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5e29489-3240-47a3-a24d-e02f068d1e0c/rcbs_chargemaster_1500_scale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2587089f-e920-4f8d-9bb6-db33b7d418a8/xisuzezaji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eb242b9-9a90-4573-b2aa-55b66c8b5deb/98399926302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6239c85-0c19-4883-b9f1-8a34d397f7c9/62701493258.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/70679722584.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_off0000de08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE08 5868 bytes
SHA-256: 253ba31289d96b5226276017b047918fc36a1d3a12ca3e5358507828595c97a1
font_01_sfnt_off0000f213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 10828 bytes
SHA-256: 13c00d82ed136290c8687b09df966b67d45c2099192c668f80221fbf83971827