Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9c4d03d0abfcfe9…

MALICIOUS

PDF

79.0 KB Created: 2021-05-27 03:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1af99ce35ec22d164b2bab6d56a59648 SHA-1: 210f633e5585e0fa60bb4bb29241a16c15a0e4de SHA-256: e9c4d03d0abfcfe9b7a6791227cb0c078ede279ab5ec1f66a6d7c6bcff297e8f
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and a potential phishing or malware distribution vehicle. It contains numerous external links, with a primary suspicious URL identified as 'https://nipisod.ru/strik?utm_term=abstraccion+en+programacion+orientada+a+objetos+pdf'. The ML classifier and ClamAV also strongly indicated maliciousness, suggesting the document is designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/strik?utm_term=abstraccion+en+programacion+orientada+a+objetos+pdf PDF link annotation
    • https://mewuvirinikupu.weebly.com/uploads/1/3/4/5/134505229/fobegenisus.pdfIn PDF document text
    • https://weposatozexutav.weebly.com/uploads/1/3/4/3/134314203/f4cc6c07.pdfIn PDF document text
    • https://fitulepam.weebly.com/uploads/1/3/0/8/130874207/binateselun-wepevavilulomus-roxafezajuj-tanik.pdfIn PDF document text
    • https://mawokivujuruti.weebly.com/uploads/1/3/4/6/134685386/3b6415e21d249e4.pdfIn PDF document text
    • https://vorujefam.weebly.com/uploads/1/3/4/3/134322124/7012299.pdfIn PDF document text
    • https://nimubawelekuf.weebly.com/uploads/1/3/4/2/134265751/nunoj-lidoxixenotas-finivofodu.pdfIn PDF document text
    • https://nugelemuv.weebly.com/uploads/1/3/0/7/130739301/8960967e2c6.pdfIn PDF document text
    • https://divigutokorafo.weebly.com/uploads/1/3/4/6/134683056/7379736.pdfIn PDF document text
    • https://givurili.weebly.com/uploads/1/3/4/6/134605008/lejezakitif_xezipirofofegol_zumoja_fopaloxaniv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386621/normal_6032ba352b472.pdfIn PDF document text
    • https://gosovusini.weebly.com/uploads/1/3/2/6/132696158/1836163.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380691/normal_6005042a1dcb0.pdfIn PDF document text
    • https://wapinabukodinu.weebly.com/uploads/1/3/6/0/136051982/9645593.pdfIn PDF document text
    • https://rogetaguw.weebly.com/uploads/1/3/1/4/131407632/wapov.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/21192d81-6528-4bbe-b98f-9722df79d3e6/the_secret_garden_book_review_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c21948bd-5a60-4066-b243-8841d6bf5e63/spoon_river_college_softball.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8315ec92-d180-41cd-80da-b71a37d33f5e/what_are_mandatory_sentencing_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fabf26aa-25fb-45e9-b315-88fd25429620/31264316294.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/281d7bb8-dae2-4055-8254-886964bd7409/mapevefokomumijujekofis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/054140eb-360a-42c3-8c7b-f12868f0c519/37327053925.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d55100bd-11de-448e-9a60-06f5579fcd4e/tovinaresas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/975ea06e-ecf8-4ff0-bdce-4ec2d94b03ee/wupojopixerari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80bfb10e-8031-40ad-9aaa-a6b0a3bbbd2d/best_counter_depth_refrigerator_brands_2020.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_off0000f063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF063 5648 bytes
SHA-256: 1bf598a57dd74c378ee37d3237994dc04ee89188a7e54258e2753b2a9e0ce880
font_01_sfnt_off00010385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10385 12604 bytes
SHA-256: a509eb2a9a1fcfc82c4a1dd33786babec6bfd5b0b58110fba9589d75bed98d57

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