Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45ec8432b3933ce…

MALICIOUS

PDF

71.6 KB Created: 2021-02-18 08:18:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 58154cfe5a1c78db20617e0d41136964 SHA-1: 9951d38cd95e6c550e13e2d2c82ac4cc6cf7a550 SHA-256: a45ec8432b3933ce969d84dfb465f1be3c038f09d12ebec5d0468582844d164f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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=java+for+dummies+free+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444643/normal_600c0166d5d1b.pdfIn PDF document text
    • http://blockingscenery.com/nuwomixuregabadowvsecz.pdfIn PDF document text
    • http://regsenatvumen.website/dropcam_pro_user_manual4i9sd.pdfIn PDF document text
    • http://djami.ru/jazogizevefadizoz5xol3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428033/normal_6029d4cba3b5e.pdfIn PDF document text
    • http://mmuuue.space/45630279798miue.pdfIn PDF document text
    • http://zowomojagobipur.iblogger.org/45898757358.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475215/normal_601f38c7a922d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384825/normal_60047e023f8f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pebulibupa.rf.gd/browns_injury_report_week_2.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/ssd_performance_versus_hdd.pdfIn PDF document text
    • http://zuxekesimulir.epizy.com/bilavidezabomove.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/church_confirmation_letter_template.pdfIn PDF document text
    • http://fanixagef.rf.gd/2327132654.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/search_console_data_studio_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA0 5132 bytes
SHA-256: d6596ab2ac8c02410e42a2331a0e8dc7dea8f48988395bc9f4625e326c7e8630
font_01_sfnt_off0000e006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE006 10356 bytes
SHA-256: 9ab0f21e7663710d4cec83c51f869158f476418bd5f35ef105e2772861745bb7
font_02_sfnt_off0001037f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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