Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73b50ba4b176142…

MALICIOUS

PDF

85.3 KB Created: 2021-03-23 21:30:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ba436e03f0d40643cdff7f7d85f184d3 SHA-1: 9f02c640fc9c8d7869caa5092fd65424d3186280 SHA-256: d73b50ba4b1761420d3cd5653ed92b9ea68a8fe9c9a85b6165e2766fb7685bfd
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 0.9996

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://kuzutuzo.ru/wix?keyword=csr+racing+hack+android+apk+download+free PDF link annotation
    • https://kesesitevon.weebly.com/uploads/1/3/5/3/135317357/cb6c6.pdfIn PDF document text
    • https://mutovowi.weebly.com/uploads/1/3/4/8/134862221/1579167.pdfIn PDF document text
    • http://kujunat.medianewsonline.com/pdf_splitter_and_merger_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390664/normal_5ffb5ed7d8ad7.pdfIn PDF document text
    • http://bestsaleshopin.xyz/iron_deficiency_anemia_in_pregnancy_guidelinesgu3og.pdfIn PDF document text
    • http://fsfsfd.xyz/230543579297oslp.pdfIn PDF document text
    • http://maewallace.com/37579420493yaloh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412905/normal_5fdf6c7e31c5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380070/normal_601ae2817bd43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417830/normal_6053eedbaf327.pdfIn PDF document text
    • https://wekosidofanepa.weebly.com/uploads/1/3/2/6/132696212/baguxodiden.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424997/normal_5fd650afde8af.pdfIn PDF document text
    • https://koponabunabo.weebly.com/uploads/1/3/4/5/134520941/1d860ddb326.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5fe99272ae53c.pdfIn PDF document text
    • http://wedidizelajat.mypressonline.com/8405820640.pdfIn PDF document text
    • https://biwilodumiz.weebly.com/uploads/1/3/4/3/134319983/masovo_lutoded.pdfIn PDF document text
    • https://finedogu.weebly.com/uploads/1/3/4/7/134749629/xixinadorazugovuxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454179/normal_605639f920cfa.pdfIn PDF document text
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/memewa.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://wugetad.myartsonline.com/how_do_i_update_my_samsung_software_on_my_computer.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/duwelijutumozuganekiperab.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_off0000f490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF490 5304 bytes
SHA-256: 44f187c62e4d29f75e77c26c8d7332222fe2dbbf9c89fa2cf1ff4d5659bc1734
font_01_sfnt_off0001069b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069B 23272 bytes
SHA-256: c722a699c9ef7df4bd1b299094ce862259c780b848b7d11e45a00a2ee81ee56b
font_02_sfnt_off000138ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138CA 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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