Malicious PDF — malware analysis report

Static analysis result for SHA-256 171925090165e47a…

MALICIOUS

PDF

80.3 KB Created: 2021-03-29 01:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 002bab5ce04a739d3aadede06e1f02f5 SHA-1: 57a88bc04739c69826c2debfae944aaf39c8a6f1 SHA-256: 171925090165e47ab5d56634b54b0376180c46b9036f0e944b29ecc0044669db
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

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/wix?keyword=duo+therm+air+conditioner+filters PDF link annotation
    • http://kvrovk.xyz/29330614084bvk75.pdfIn PDF document text
    • http://reduslimitaly.website/mario_kart_mobile_challenge_guideuwpdn.pdfIn PDF document text
    • http://bunnygummy.ru/best_american_history_books_for_middle_school1ppen.pdfIn PDF document text
    • http://edevletorg.com/first_aid_usmle_pricefsa2q.pdfIn PDF document text
    • http://prizinsta24.online/friction_and_gravity_lesson_quiz_worksheet_answer_keyw63rf.pdfIn PDF document text
    • http://tcerkovniekupola.space/duzuno7i4ii.pdfIn PDF document text
    • http://shop-kid-toys.online/nezovuboxiwodovosozuvinyxpt4.pdfIn PDF document text
    • http://4gusevshop.website/91801031853nmj0v.pdfIn PDF document text
    • http://marifivelaj.mygamesonline.org/fumufumudekubulivojiwes.pdfIn PDF document text
    • http://cashthe.ru/bluestacks_4_new_versionphq74.pdfIn PDF document text
    • http://rusadezebep.mygamesonline.org/electronics_engineering_books_free_download.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://f27bca7f-571c-471d-9e77-92385e6dfcd0.filesusr.com/ugd/9a0fa1_c64057e86fc5408d89aa035bafb6e13d.pdf?index=trueIn PDF document text
    • https://d23eb412-52e1-45ef-a32a-0c032022daee.filesusr.com/ugd/03485a_deb270e637034fd08e80459f4f0b6c71.pdf?index=trueIn PDF document text
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_30293d720b69412eab2eb92cb891e3ec.pdf?index=trueIn PDF document text
    • http://zedowep.atwebpages.com/crappie_fishing_lures_for_sale.pdfIn PDF document text
    • https://e7c02ae7-ba66-49ef-8fe7-d4c265c54a1b.filesusr.com/ugd/bc5701_d6afebb8610a4897a3a387ac097f93b6.pdf?index=trueIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_9a5d22fbb3694ab484324cb92af51e36.pdf?index=trueIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_b0838d8011ca4e87aa56e7115c156777.pdf?index=trueIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_ef6ceee4b1c2493d9a99e16e0556682b.pdf?index=trueIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_3cdc7fdd8be941cf98f9bea8de40287a.pdf?index=trueIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_77eac7255d0344aea3c5c19e2768ce73.pdf?index=trueIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_255885a0baa04e59a716a1f2626a8005.pdf?index=trueIn PDF document text
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_2f7fa617a9114c83a3eb8043ca3d3faf.pdf?index=trueIn PDF document text
    • https://ed8bc375-cd54-49ab-9ddb-988cb5b2fc3d.filesusr.com/ugd/3f3824_8c4e0a1ce58c4cbca918faeee2c7e242.pdf?index=trueIn 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_off0000ee5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5C 5144 bytes
SHA-256: 35447c2b6a6141d7c8ee7e0ddf6db0c94ac8117b4ed9703853247b29c2c00486
font_01_sfnt_off0000ffb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB7 11040 bytes
SHA-256: 7a24cf7db5df8691e584addddbc2405c0707ca3fe1f0392168d8b9adb20f95ff
font_02_sfnt_off00012574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12574 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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