Malicious PDF — malware analysis report

Static analysis result for SHA-256 8819349ee9afe1d1…

MALICIOUS

PDF

70.7 KB Created: 2021-02-21 18:41:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ad866493f17a0eb0bd54d721f7d9f93f SHA-1: 1746ca9ec2969d57ad9d78c0e36e142b1ca637cc SHA-256: 8819349ee9afe1d1811367a4ed29c4bd55fad9d6b8365eaa7c7e2db6e3cec00c
126 Risk Score

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/aws?utm_term=developing+the+leader+within+you+summary+pdf PDF link annotation
    • https://muxixeronazuxup.weebly.com/uploads/1/3/4/5/134508557/5925117.pdfIn PDF document text
    • https://gajifawegux.weebly.com/uploads/1/3/4/6/134649352/dibavoli.pdfIn PDF document text
    • https://zaridonuxubotu.weebly.com/uploads/1/3/0/7/130775126/zerujajosovokemuxesa.pdfIn PDF document text
    • http://fruit-ital.space/sikesubowawosakuzjh7dj.pdfIn PDF document text
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/7644241.pdfIn PDF document text
    • https://rewesiriwo.weebly.com/uploads/1/3/4/3/134318955/gozitepipekurixavu.pdfIn PDF document text
    • https://gasomuvujutomeb.weebly.com/uploads/1/3/4/3/134356107/2271198.pdfIn PDF document text
    • http://legendarycraft.ru/the_deep_peter_benchleyblewt.pdfIn PDF document text
    • http://faceit.su/kindle_app_not_showing_up_on_androidhqthf.pdfIn PDF document text
    • https://taxufutusa.weebly.com/uploads/1/3/4/5/134514166/28670f93505e64.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/american_truck_simulator_mods_free_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/bfa_alchemy_level_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/xitagakabesavinugurowo.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/adobe_flash_professional_bagas31.pdfIn PDF document text
    • http://bagirisuteladog.rf.gd/jugovodugevage.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_off0000d6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FC 5708 bytes
SHA-256: 4a0762d5c6ca6e6272c249f5408b70718dfeae8b56a8a939550a762a1e0ebb73
font_01_sfnt_off0000ea67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 10300 bytes
SHA-256: ab674321ed2bcd947861387b3e7aed68b91b24f4028b96955a2d3d09a1b2cd1f

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