Malicious PDF — malware analysis report

Static analysis result for SHA-256 e957742f6e228087…

MALICIOUS

PDF

82.1 KB Created: 2021-05-11 17:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 346e17b191bcd36d215fb1576abd50ff SHA-1: eb8e3ba42803159479606234efebc2f57e07b26d SHA-256: e957742f6e228087b34bd9355707018f9e3a2f86430f4bb800806e8442411142
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-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://maypoin.ru/strik?utm_term=civ+6+gathering+storm+deity+tips PDF link annotation
    • https://cdn.sqhk.co/lunexubafexo/hjbiege/mawunulolosizisararuxubin.pdfIn PDF document text
    • https://cdn.sqhk.co/fajoliteve/Rrjf6Sl/best_singer_of_90s_bollywood.pdfIn PDF document text
    • https://cdn.sqhk.co/wepiwojeta/s4hcjbL/apex_weather_tomorrow.pdfIn PDF document text
    • https://fogenidu.weebly.com/uploads/1/3/4/3/134391000/47fd044.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/jh7pjgu/lusasel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383923/normal_6039092a9267c.pdfIn PDF document text
    • https://nenusobodi.weebly.com/uploads/1/3/1/4/131406558/xagirawanivanu.pdfIn PDF document text
    • https://magudutetu.weebly.com/uploads/1/3/1/4/131437318/milukavude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451566/normal_6056442a900b6.pdfIn PDF document text
    • https://mapulanedubo.weebly.com/uploads/1/3/0/9/130969056/gumamobabezigi.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxogubajo/M4cje2t/kupemaduwozisimixeze.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/afda947b-0343-4baf-8c09-8c24748bc935/72751716639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dac6648b-7a61-4e11-bcf3-1fc80b38cb58/how_to_integrate_drivers_to_windows_7_iso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89ccaba2-8d60-471b-a6a2-1eb34e0aeac6/zixalisome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46208412-aa28-455e-8fd0-64a6318d0a6d/jotuk.pdfIn PDF document text
    • http://sosufilupovij.epizy.com/64185130489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/141fce5d-e268-4244-a80f-57bea68f15d8/85447043380.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3b86195-b41c-436d-834d-9ebf4699a6a3/bofufax.pdfIn PDF document text
    • http://sesunofopum.epizy.com/hiwin_linear_guideways_cad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/267b9ffb-db96-4d9b-8459-b2b805251bfa/579605942.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_off0000fea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA8 5564 bytes
SHA-256: 53b96cc28203bd8baa0dda2230dce88ec03efdf8d72c2fe09aa9fe52279651f7
font_01_sfnt_off00011170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11170 11892 bytes
SHA-256: 4bfa8b9ba72c66dcfd67e33f3a436876c0e6518d2a65f5e99938d3c4e99edbec