Malicious PDF — malware analysis report

Static analysis result for SHA-256 360e8d015ec7b938…

MALICIOUS

PDF

74.4 KB Created: 2021-02-26 05:55:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cf5d44235c41391da18eed3af8d89b94 SHA-1: 4714dd29b32fc11151d8b563953d9436437ec5fe SHA-256: 360e8d015ec7b93876bde146b68330086cb6e65058b9fbcc44668a28da3ddc32
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically appearing as a search result for a common query, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/123?utm_term=is+facebook+having+problems+with+news+feed PDF link annotation
    • http://burrrhey.tech/esl_mixed_conditionals_worksheetdbgtt.pdfIn PDF document text
    • https://cdn.sqhk.co/rujoremebi/vdSx3hc/43755569014.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367916/normal_5fee2ba3d3800.pdfIn PDF document text
    • https://cdn.sqhk.co/luwivimexu/7jbTidm/the_farmer_s_dog_food.pdfIn PDF document text
    • http://italywow.space/tagonotwrm.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/cJicIjf/notujebipemis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459467/normal_60122fd57c858.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446390/normal_60323d714ea6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425514/normal_6009af15382ed.pdfIn PDF document text
    • https://jodisugej.weebly.com/uploads/1/3/4/7/134732418/ponopejajinanoxikuko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jefebewo.epizy.com/aha_acls_book.pdfIn PDF document text
    • http://jipaxesu.rf.gd/don_best_injury_report_wnba.pdfIn PDF document text
    • http://robebiwasufilu.epizy.com/android_studio_windows_10_issues.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_off0000e4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F7 5860 bytes
SHA-256: 3dbecd88634a254170780f6db7d6d12310799020d8d733fcc0fee64424219111
font_01_sfnt_off0000f8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D5 10424 bytes
SHA-256: d95bbc0ec823d8f9d32cc8af3fad1dfd7505b3efb39b90fadb08be5c5c02aa95

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