Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ebf87bf542ae4c…

MALICIOUS

PDF

75.5 KB Created: 2021-03-10 23:46:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 06e694b733dfdb0a9e5f84d05c24cdb6 SHA-1: 5d51032956f7c7b60d5963b80a0274b23138486a SHA-256: 18ebf87bf542ae4c28fa75596c21a2063276e5b75e68fac813b2ae1cda30a55e
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 0.9990

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://nipisod.ru/aws?utm_term=lenovo+thinkpad+t430+charger+specs PDF link annotation
    • http://zisuroto.mygamesonline.org/zatididizugananupaxapo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500444/normal_5fcbd24244886.pdfIn PDF document text
    • https://forugizatufuru.weebly.com/uploads/1/3/1/4/131410167/6b7bef.pdfIn PDF document text
    • https://zaxewunatomilar.weebly.com/uploads/1/3/4/1/134131499/6203081.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417122/normal_60433b4f3e23d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390385/normal_6023e5f9f3a06.pdfIn PDF document text
    • http://jefozogez.66ghz.com/adjectifs_et_pronoms_dmonstratifs_exercices.pdfIn PDF document text
    • https://xevekarisugi.weebly.com/uploads/1/3/4/6/134697334/4116626.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/23150862990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388835/normal_6009f326ee67d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409997/normal_600005a757514.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/6a3ab034-b641-4bca-986b-1f5310c7ecf0/44521818387.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a451364c-d13f-4963-b132-e2d69b54c58e/zulimeparoxobuxafokulo.pdfIn PDF document text
    • http://sabixukavizom.myartsonline.com/m_audio_fast_track_interface.pdfIn PDF document text
    • http://lirepotinemos.rf.gd/44770701907.pdfIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_275b6531486e46d7a8451eb6a362c9ac.pdf?index=trueIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_71e78ae1e14f4acaa1d96f0f50c93d13.pdf?index=trueIn PDF document text
    • https://4868a29a-6d77-448d-a9c5-bc5c6a1713c3.filesusr.com/ugd/060e50_914a3b80ba1443cfa5b6c61b89e70b7f.pdf?index=trueIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_ebb9e1f5c93b4105af2d72953ca9cb8e.pdf?index=trueIn PDF document text
    • https://8d9f32f1-468a-4e6e-8fd0-236262902e57.filesusr.com/ugd/28860c_44a35495ed8749f18d9d7526efa1210d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c909f41c-ff2a-4c73-a592-85c79d51f40f/93709344794.pdfIn PDF document text
    • http://batevawave.epizy.com/the_cask_of_amontillado_text_dependent_questions_answers_key.pdfIn PDF document text
    • http://mizebud.rf.gd/is_the_texas_driving_test_hard.pdfIn PDF document text
    • http://satawakerexe.atwebpages.com/fumuvunupudadigod.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_off0000e32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32F 5760 bytes
SHA-256: a1d688f1edaa1d23e89184610e632c3af1e0935bdfaa65b0e0f5099a8207f835
font_01_sfnt_off0000f6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DB 11872 bytes
SHA-256: 709594e32d5cc361ae1e35eac70dd92e286dd58e8a3a2eea0f8786104be69730