Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e92b7d669aa4b15…

MALICIOUS

PDF

94.1 KB Created: 2021-04-11 12:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 538bfd79a61a8296ed72cf3f7cde5124 SHA-1: 91503b881287ddb6855eab0d1c83ba4f01df571f SHA-256: 9e92b7d669aa4b157425badbaf3196ec029aac42a88d7b64f3aa13b15e4c6746
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable domains or hosting services, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for exploitation.

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://baarspo.ru/strik?utm_term=2005+nissan+frontier+se+towing+capacity PDF link annotation
    • http://gerakaxow.22web.org/dajadugovodumuli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386335/normal_601b45d54a0f3.pdfIn PDF document text
    • http://rejuxipo.iblogger.org/dead_space_3_ps3.pdfIn PDF document text
    • http://virepidutajal.iblogger.org/a_level_biology_exam_questions_and_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496616/normal_5fd273f5cea90.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/lenovo_t430_supported_ram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b509dfd2-78b5-4155-b4ae-ad3e4f1050b8/14419337851.pdfIn PDF document text
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_ccefe6b0aa6e4f8ea161d9b432454334.pdf?index=trueIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_97e2e9ce3be84cf58f3da2080579a040.pdf?index=trueIn PDF document text
    • http://webubekesivamuf.epizy.com/5617944333.pdfIn PDF document text
    • http://sozakerikiperoj.epizy.com/bultmann_new_testament_and_mythology.pdfIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_76f667ab59bd416f983e722df909b91a.pdf?index=trueIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_e2d24fec82494f37af389536feb06cd9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fccb2db5-1f11-4fd6-b146-aafececca773/mba_admission_interview_questions_and_answers.pdfIn PDF document text
    • https://535f918c-e50e-4760-9dbe-4b22a9cc1357.filesusr.com/ugd/65883d_38921cb03bdc4008a010880737d8511b.pdf?index=trueIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_fd22d15194af40e0b4d415b04c02d3c2.pdf?index=trueIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_75ba8b83115e459692e850809db2a42f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xopugup/finapuj.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/dividend_growth_model_excel_spreadsheet.pdfIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_da2a0eba1aef49a2af070e97470262dd.pdf?index=trueIn 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_off00012c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5E 5648 bytes
SHA-256: fd379eb0df5cd12ff95e8eb025706361579924854f353c0a60c0a4c5d2bcada9
font_01_sfnt_off00013fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCA 12844 bytes
SHA-256: bec868eca3ce6e555087620ba9775a03f14af4d5ec85cff1ebc8caa2c215b0f7