Malicious PDF — malware analysis report

Static analysis result for SHA-256 d540820b225489b4…

MALICIOUS

PDF

111.7 KB Created: 2021-05-13 17:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c5fe292ddd04192cb6936a35a9cc7952 SHA-1: ea838e87b5dadcfb6a84abfff740524ebe1c2e62 SHA-256: d540820b225489b4ba1c9f42c11cc71a0b8e7ca3c98dc6a311dba578b864d792
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

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://seumenha.ru/strik?utm_term=old+regime+france+three+estates PDF link annotation
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/1321883.pdfIn PDF document text
    • https://buserakufazuwus.weebly.com/uploads/1/3/4/0/134097478/7321353.pdfIn PDF document text
    • https://naziwimirup.weebly.com/uploads/1/3/4/3/134371197/7869986.pdfIn PDF document text
    • https://lasuresupaka.weebly.com/uploads/1/3/2/6/132683400/jofagawenuwozi.pdfIn PDF document text
    • https://lizameguxif.weebly.com/uploads/1/3/1/6/131606128/73d48a.pdfIn PDF document text
    • https://munejubulogulep.weebly.com/uploads/1/3/4/2/134266186/pujilazobesutokawim.pdfIn PDF document text
    • https://nofixemi.weebly.com/uploads/1/3/6/0/136082439/8503250.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_dfd60ba2bfe0496b81a569a4776e72b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/bastar_university_time_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce60a20-1a10-469d-a19a-2170afa547c5/75613318917.pdfIn PDF document text
    • https://ad217471-f301-4d07-b05b-71cdb813ff8b.filesusr.com/ugd/4f915f_60c3f71beb56407d841182c5a9ecc09f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/us_army_recruiting_badge.pdfIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_a162a1be60874744b501b3a5245b4251.pdf?index=trueIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_a6f9b90058a64f8b99e5be1b1588fa81.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/semadevefadilosufodivedap.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/discord_admin_application_template.pdfIn PDF document text
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_7500dcfea2e84347bb1c333dadc1162a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1bc2ba6-a534-4748-9cdf-d29663276987/bizofikojigef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf300dc0-acd1-48ed-8f9a-fb6e48604452/wipovivubivi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D86 5464 bytes
SHA-256: 934f5e9f4673c7a290eac2d0aadf3dbb589a8e86de3672d2dd6d7eb509bf1730
font_01_sfnt_off00016fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FED 13404 bytes
SHA-256: 32a19bec20b4a136aad3aba4b9b39a440fe58bd13c8c5eee6422f7a570ed49bc
font_02_sfnt_off00019a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A2D 16168 bytes
SHA-256: 0216150ac0e5ade23b072752459620ec704bdac01526bfbadd96d51f96873ef3

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