Malicious PDF — malware analysis report

Static analysis result for SHA-256 91587d05df980cfc…

MALICIOUS

PDF

71.5 KB Created: 2021-06-08 23:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d9a3b2485ca71a9a3912fddc60c3867e SHA-1: de2772df5352e8e7f62f5afd4b5140ac605912af SHA-256: 91587d05df980cfc89af49b1b0ae60fdf0bf83412cdebf0f4f549b338411c117
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 0.9998

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://huntic.ru/pbw?utm_term=thoptv+live+test+match PDF link annotation
    • https://wajajudamivigo.weebly.com/uploads/1/3/4/3/134359543/vazatikivelafo_wegelej.pdfIn PDF document text
    • https://sovopubi.weebly.com/uploads/1/3/0/7/130775052/81f1d.pdfIn PDF document text
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/1037213.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391920/normal_60bec65712af1.pdfIn PDF document text
    • https://kegorobaz.weebly.com/uploads/1/3/5/9/135963119/3799380.pdfIn PDF document text
    • https://nugaruxiboxora.weebly.com/uploads/1/3/0/7/130738781/wekite_gutofe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365608/normal_5fe1cace00dee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456387/normal_6061fd0f3d1df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486363/normal_5fe63ad99a9c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472491/normal_5fe911e94ccc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482189/normal_603aa4ad3f950.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489598/normal_6051f1d0ab8da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487665/normal_603589609d677.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9547f79-81ad-4ef0-ae42-343c566f95ae/venapiwiwumam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b88498b4-4777-4899-ac6d-d7e97c15168d/27611277546.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ef8f01e-eb9f-4a5d-9fdc-f286053dec47/kufiziruvavebanexaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad63df41-5c94-458c-9130-2dd902299388/rhetorical_analysis_thesis_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1c3ff86-c510-4f63-866e-17b7fd556aa6/when_did_greece_start_democracy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/102fd7a8-c129-403d-9cb8-06d24fde41c9/dell_xps_8300_bios_update_a07.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81dcff98-2312-49d0-84da-5c7ec0451136/vuvarorutopuwo.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_off0000d8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C7 5088 bytes
SHA-256: 048e4309d56664ceda4b56c20c82577926995b60ef5573dca7d7b076ff3ac9df
font_01_sfnt_off0000e9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F4 11120 bytes
SHA-256: 73afb0361fc8f8139cd3269c633d5fe64684b829790176ac849f74dc7acacbde