Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a821424b9ee1c79…

MALICIOUS

PDF

62.2 KB Created: 2021-02-15 16:57:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c17f3216ea8e11f002b210f1d6661c3c SHA-1: 3416671655ad7643c68fc864c60f55c91cceb34d SHA-256: 1a821424b9ee1c7953be6b8fafb0ca008dca0857cb5bbf172c3e2a4fd9b63ea2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing for a large external link farm. The document body, though truncated, suggests a lure related to educational content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO spam, leveraging embedded links to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=chapter+38+digestive+and+excretory+systems+answers PDF link annotation
    • https://xupalodigodub.weebly.com/uploads/1/3/5/2/135298884/radezojidafago-sazepi-togeneruv-rulutatuje.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/ogeVzij/konevirutaxebu.pdfIn PDF document text
    • https://fukagopesuzidad.weebly.com/uploads/1/3/1/3/131381553/2214421.pdfIn PDF document text
    • http://zogufovitem.22web.org/82167099957.pdfIn PDF document text
    • https://maxegexetafes.weebly.com/uploads/1/3/1/3/131379525/75870.pdfIn PDF document text
    • http://kedejusofapirej.22web.org/economic_systems_comparison_chart_worksheet_answers.pdfIn PDF document text
    • http://govejulij.22web.org/yugioh_forbidden_memories_grinding_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://labinugekifuv.rf.gd/bound_to_vengeance_2015_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/tratamiento_de_blastocystis_hominis.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/http_ebira_reporters.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/vuxagepivupowejas.pdfIn PDF document text
    • http://tosizufokora.epizy.com/sewov.pdfIn PDF document text
    • http://rozazidugo.epizy.com/device_driver_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/android_os_battery_drain_s9.pdfIn PDF document text
    • http://kodadus.epizy.com/tabel_asmaul_husna.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_off0000b7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BC 6040 bytes
SHA-256: 1d0752792da288bfa5dc9ec03acba0c7ddbebb08d00e2101dc51f704db45f6d7
font_01_sfnt_off0000cc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC36 9264 bytes
SHA-256: 1b0ec75728d6669088e50f277b29a6c39c57b232f0adf9a7fb23f80ea4c4bf6d

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