Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0cf32c43ca8b656…

MALICIOUS

PDF

74.4 KB Created: 2021-04-20 22:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f0a32fe1300a42fa936e2b42515ec4f3 SHA-1: 40411e0f271efd18df1ff30bb8b6696c0223577a SHA-256: d0cf32c43ca8b656ddc2542800634a8cba25db2b1328d6cdedb1e5d180f4299c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm or designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://resalured.ru/strik?utm_term=snark+ukulele+tuner+review PDF link annotation
    • https://nuwofukejixi.weebly.com/uploads/1/3/1/4/131437867/suvera_bokeloxufu.pdfIn PDF document text
    • https://ximapufem.weebly.com/uploads/1/3/1/4/131437784/5727966.pdfIn PDF document text
    • https://zadujemerumid.weebly.com/uploads/1/3/2/6/132695269/92242c80.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://058da8ce-bb30-4b8c-81eb-8903018cac65.filesusr.com/ugd/ab745b_3dc8635bbf87415fa345d43d003cd64b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bodajaku/open_office_online_spreadsheet.pdfIn PDF document text
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_a1ee24b16c274cfc9d98716fd21f7a50.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/bejur.pdfIn PDF document text
    • http://lirepotinemos.rf.gd/93770937998.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/advanced_excel_functions_for_statistics_and_data_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/nazizuvejaj.pdfIn PDF document text
    • http://napipipazapuka.epizy.com/72217000679.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/vevivatapuwesulu.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/10878645515.pdfIn PDF document text
    • http://penenidapuveg.epizy.com/wofimokarabafevatanar.pdfIn PDF document text
    • http://demiwadipojaz.epizy.com/12103640111.pdfIn PDF document text
    • http://pufupivati.epizy.com/55492651593.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_off0000e711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE711 4820 bytes
SHA-256: 2f9ff4ff46b590bc0a8857d104b1a03ba8441e3d204694a41b9a51de13909ebd
font_01_sfnt_off0000f798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF798 10424 bytes
SHA-256: 05e75a6072d3c96db4f5b88c37e9caa3dde9f6bfa30ab78bbf83663c48fbc05e

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