Malicious PDF — malware analysis report

Static analysis result for SHA-256 5134e21c34880b50…

MALICIOUS

PDF

82.3 KB Created: 2021-06-01 05:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 0f51173718437ab281c1dc6a396fb609 SHA-1: ef4c92d619f153c77fa3cfc1b4f86aaddc8f5222 SHA-256: 5134e21c34880b50c5bc0239a07f04b54090aec529a7d1aee352ed5c76473deb
186 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML models and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous external URLs, with a primary suspicious URL being https://inwebjor.ru/pbw?utm_term=special+right+triangles+worksheet+cross+out+the+correct+answers. The document's structure and embedded links suggest it is part of a phishing or SEO spam campaign designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://inwebjor.ru/pbw?utm_term=special+right+triangles+worksheet+cross+out+the+correct+answers PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4479705/normal_60b0a3634cbd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451954/normal_604e76f8c38f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468268/normal_604f6ad8b7082.pdfIn PDF document text
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/3584243.pdfIn PDF document text
    • https://leguwilevifemat.weebly.com/uploads/1/3/4/5/134595517/kalukiketozeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372376/normal_5fc7d459c19f0.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/007c029a-110d-4c85-adf7-bd049b109b74/31259404842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2966e267-333c-40a9-81d0-8b7909933f64/23211334835.pdfIn PDF document text
    • http://dawijunegolo.pbworks.com/f/baboketajazetog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3b8ddbd-3176-40f7-9d4a-8d5a536a090e/1654110283.pdfIn PDF document text
    • http://funinupun.pbworks.com/w/file/fetch/144425064/descargar_starcraft_portable_para_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee8f1a82-3602-499f-b48b-33a9afd2c472/printable_kindergarten_reading_comprehension_worksheets_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/816fa144-ef20-4cbb-bf36-b88f8f42bc91/what_are_two_objectives_of_a_database_management_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a836e92-eda2-4bf2-b77b-01c7627f0cde/nemefonivatulifif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8505eb32-36f4-4969-bbe6-39a8b3c6622a/neatcell_picosecond_pen_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24142329-9e9e-43c8-b5b9-1eac2cd586dd/what_are_cognitive_theories_in_psychology.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_off0000fe69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE69 5456 bytes
SHA-256: b75294cdd7b81e87470457f3b733d019eacc376317f82faf7214fecec97015a9
font_01_sfnt_off00011102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11102 11916 bytes
SHA-256: de5c8fe458c3b210ca21c05bfc72db265e6e75156cf10a947fdd9e978764c058

Open this report in the interactive analyzer, or submit your own file for analysis.