Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f2d9bf7750b550…

MALICIOUS

PDF

75.9 KB Created: 2021-05-14 05:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 049d114c8580d18a345fe7ea467aa81a SHA-1: 96c9f299b1b894b1ad2ce767ad45929512e1d4ca SHA-256: 74f2d9bf7750b550ffb09d9e623d9665d9f6c2a1cd136321c54e9880a852700a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://xajibur.ru/strik?utm_term=how+to+code+with+python+on+mac PDF link annotation
    • http://vukufitu.mywebcommunity.org/sbi_po_exam_syllabus_2020.pdfIn PDF document text
    • http://zilitimo.getenjoyment.net/gofoluposaliravitupena.pdfIn PDF document text
    • http://vugaganopofom.mypressonline.com/5_grade_math_workbook.pdfIn PDF document text
    • http://nisufazuz.22web.org/57952783675.pdfIn PDF document text
    • http://dilofab.22web.org/barking_up_the_wrong_tree_summary.pdfIn PDF document text
    • http://gosugas.getenjoyment.net/barron_s_gre_word_list_download.pdfIn PDF document text
    • https://deponoma.weebly.com/uploads/1/3/2/6/132696267/feremawejivatuxuwi.pdfIn PDF document text
    • http://jefuvumerusew.getenjoyment.net/que_es_la_acidosis_lactica.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/36222212142.pdfIn PDF document text
    • https://tavebesu.weebly.com/uploads/1/3/1/3/131381332/367548.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/nfl_2015_schedule_excel_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xewarokulix.rf.gd/3d_drawing_tutorial_using_pencil.pdfIn PDF document text
    • http://nagukubuliduz.rf.gd/the_greatest_salesman_in_the_world_audiobook_free.pdfIn PDF document text
    • http://maligufaribez.epizy.com/mexosaneb.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/sozixulutigimegon.pdfIn PDF document text
    • http://defakulid.atwebpages.com/chemistry_12_formula_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/75297555818.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/ashrae_refrigeration_handbook.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_off0000ea69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA69 5164 bytes
SHA-256: 8a64945d0a59bd265b93b499869b76a4bebcaae27865c17a7c2bb433b076d751
font_01_sfnt_off0000fbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE9 11284 bytes
SHA-256: 513c9dd38d7a8eaf95e90ae01520f796f7bfd04d8b92e8fa144a56e8abc5e51e