Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb10a3ac7496676…

MALICIOUS

PDF

71.6 KB Created: 2021-06-04 16:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8cba39075de0bc218dabd2b9720104df SHA-1: edb867f5cf03c2b896ac7ca1b7a42eec8785c898 SHA-256: adb10a3ac74966766ee58a747bd4e4a8c0c5266a885c33445ee3d225afe9f3a6
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 0.9997

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://chcial.ru/pbw?utm_term=mandalas+para+imprimir+gratis+de+animales PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466173/normal_6035639ada81c.pdfIn PDF document text
    • https://xuxedujuwa.weebly.com/uploads/1/3/5/3/135345360/sewipetovinamesagex.pdfIn PDF document text
    • https://xezajorawelo.weebly.com/uploads/1/3/1/4/131408008/teweko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368248/normal_6013a0cb1bb4e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kokoxudalux.pbworks.com/w/file/fetch/144427449/how_to_make_gelatin_sheets_from_powder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0f5aa59-423c-4756-9bd8-a68acb976cbd/vewidibapat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b22bddaa-437f-48bc-a4f7-f047391214bb/83087511102.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/w/file/fetch/144463776/wirukipobulobonaxevixe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0c073ec-fc1e-4306-8caf-1d013abc9814/why_do_destructive_waves_erode_coasts.pdfIn PDF document text
    • http://siseraxoru.pbworks.com/f/bloody_roar_2_download_for_windows_7.pdfIn PDF document text
    • http://wepoline.pbworks.com/w/file/fetch/144449505/why_is_genetic_diversity_so_important.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35cb8724-456c-4ebb-9a6e-bf72a4ac66a1/credo_mutwa_books_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf0055b9-bb8f-4f76-adbf-6ec485c15d47/74762927254.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a21c684d-af81-4be4-a168-b7a565104ae6/how_to_respond_to_a_positive_performance_review_example.pdfIn PDF document text
    • http://jitijaloj.pbworks.com/f/economic_substantive_due_process_definition.pdfIn PDF document text
    • http://gepefupugalu.pbworks.com/f/bexome.pdfIn PDF document text
    • http://vikowezanipe.pbworks.com/w/file/fetch/144506877/cae_sample_answer_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a0678fb-10cc-4bc7-8a67-1e6cb7388dfe/gonokibetevisulelada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa462a70-d032-4cc4-a777-6b2b4e785621/how_to_upload_a_pic_on_snapchat_from_camera_roll.pdfIn PDF document text
    • http://lesokulovisu.pbworks.com/f/molecular_geometry_answer_key.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_off0000da4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4A 5284 bytes
SHA-256: 18f572a1758380fc313ba1832bfa04bb63a672a342045d62c15bcc8762c1882c
font_01_sfnt_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 10840 bytes
SHA-256: f4d8fbdc5ef3405c866aee3aafd41d70666a9473963b011a85b68e3b5e24b696