Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08351b3ff3b38d3…

MALICIOUS

PDF

80.1 KB Created: 2021-04-04 13:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 36875c13765b8ae48513587989bd16a6 SHA-1: cf3fe46560dc013b1ea25a0abe12eead5a7af337 SHA-256: d08351b3ff3b38d3c0e7a1c01c0336b60db8aea900b6cb3bffac28b024c01646
194 Risk Score

Malware Insights

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

The PDF file contains a link farm of disposable domains, masquerading as a Coursera certificate download. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing or malware payload. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gimoguvi.ru/award?keyword=coursera+certificate+pdf+download PDF link annotation
    • https://ketabanajav.weebly.com/uploads/1/3/4/7/134707818/patoz_lokofetomunube_rusixemuvemazo_bufazedofi.pdfIn PDF document text
    • http://pl50off.info/the_walt_disney_company_annual_report_2007uiwas.pdfIn PDF document text
    • https://vodefuba.weebly.com/uploads/1/3/4/6/134688083/4701489.pdfIn PDF document text
    • https://sitepofom.weebly.com/uploads/1/3/1/4/131438718/2c7e64fef4df.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/YwhbgcW/ryan_s_world_bubble_shooter_game.pdfIn PDF document text
    • http://babbieshop.ru/research_methods_in_education_cohen_manion_morrison3ix4g.pdfIn PDF document text
    • http://ukranews.site/danny_boy_sheet_music_in_g0c8iu.pdfIn PDF document text
    • https://cdn.sqhk.co/kepebeso/9whj2OR/taxijesunotazinuxab.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/IeR2hdW/64019293465.pdfIn PDF document text
    • http://prodson.fun/70810879979bttp5.pdfIn PDF document text
    • https://cdn.sqhk.co/jojikoxazew/hhYNmGz/89211357841.pdfIn PDF document text
    • https://cdn.sqhk.co/votezevon/fhPO2iP/20337438701.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://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_97d3dc0813b64a1eb12e3c9e3ea5af55.pdf?index=trueIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_be35ad221deb425cb9868876d48e5313.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6fabd9f-2ea0-46f6-8986-6c704b814042/what_is_the_tough_on_crime_law.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ede6b078-3ba4-46ad-947b-81a016a78a29/preventing_medication_errors_tutorial_from_the_davis_drug_guide_for_nurses_online_resources.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d520ab1-bd07-4258-903b-63370c0c46ee/descargar_diccionario_espaol_italiano_gratuito.pdfIn PDF document text
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_5832f792d983470cb5743fd93bc6b6a5.pdf?index=trueIn PDF document text
    • https://41d9b059-0b17-466b-96e6-f31a3f3e9b19.filesusr.com/ugd/f1ead9_2c40a4fe5a714c25a1297483a6717ac3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b424383-6042-4c16-b6a1-217b185feefa/cfd_analysis_in_ansys_workbench_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/685adefc-04e8-4c1a-aa2c-c855233ec2d3/jejogenuworedaporiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/febee05a-302b-46a0-ba8d-6fb28bfb3bab/old_us_army_recruiting_posters.pdfIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_a593578458474b07ad3137fff553fcc0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e675751e-ae7d-42b4-a4b0-e1346dec104d/area_of_shaded_region_circle_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65afec41-09b2-403f-b051-ffbb3836702a/boganedifafenutukezovizog.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_off0000eaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 5148 bytes
SHA-256: ffd564a72069d2e938a03e81c3f67927f805e086a07b785a161f6966975478bf
font_01_sfnt_off0000fc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC63 11316 bytes
SHA-256: 1182f7e13effdb4d8ae39cd781824ddc1d83c223cbb5998231254e57d86c1c54
font_02_sfnt_off000122dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DC 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230