Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba789a5126b0fde…

MALICIOUS

PDF

83.5 KB Created: 2021-04-16 02:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3a1d59ac96ce5083c83194c5348947f3 SHA-1: f1b3a34c1a3b375c3380022b9de6323099d127ff SHA-256: bba789a5126b0fdedd6bf184e993faf8549cf7fa89ad588273e613e30397632c
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 0.9995

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://golowaki.ru/strik?utm_term=u8+smartwatch+troubleshooting PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457311/normal_5fdaae4cccfd7.pdfIn PDF document text
    • https://vebuxevofarina.weebly.com/uploads/1/3/4/0/134013543/6bb0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390641/normal_5fdb19e0919ff.pdfIn PDF document text
    • https://kuwuvolabakeg.weebly.com/uploads/1/3/1/4/131407812/raxapuzo.pdfIn PDF document text
    • https://belavapapase.weebly.com/uploads/1/3/4/4/134444277/fobunivakexulinota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453560/normal_601233a975bb9.pdfIn PDF document text
    • https://jemikarabon.weebly.com/uploads/1/3/0/8/130815017/4761860.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426547/normal_5fe23d9859706.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5fd68a4a0a216.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453764/normal_6057bddad734a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408343/normal_5fc67b21930ff.pdfIn PDF document text
    • https://murenelu.weebly.com/uploads/1/3/1/8/131856612/ponoronesuviro.pdfIn PDF document text
    • https://voxapuxunud.weebly.com/uploads/1/3/1/3/131381802/911d250959.pdfIn PDF document text
    • https://xovatikawe.weebly.com/uploads/1/3/4/7/134726086/sukegigijijis-sobuwozizitaz-xigemakopejije-dutigigasat.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://s3.amazonaws.com/wifiduxezo/que_es_conocimiento_segun_autores.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/721ac573-e1a3-429c-ad07-d87b00ef3cd7/wenuvixasujurolazovatat.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/inline_stylesheet_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/536064a9-06e3-4596-9377-d0db0820ded0/how_to_turn_off_samsung_galaxy_a10e_without_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb3e189a-0c30-4f17-81ab-36e24392e55e/top_java_coding_interview_questions_for_testers.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/lagifubodesonesevad.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/quick_grammar_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c40f42b-0dde-4045-9ffd-3c9fe0ac56cc/mechanical_engineer_job_roles_and_responsibilities.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_off0000f845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF845 5512 bytes
SHA-256: f78f70db143231fadcb33c3d525944d222c615666f79624a495d14a6473f3edd
font_01_sfnt_off00010ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE7 11572 bytes
SHA-256: 05b5a17363b6d6c849be6224faac6489c583c7688665d86add6b4593a0aaf517
font_02_sfnt_off0001327c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3