Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08f9d0a0f99c423…

MALICIOUS

PDF

76.1 KB Created: 2021-03-21 06:52:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b30c96ea884781cb717b79058c59086 SHA-1: e215dcd5ff78619adf5318d27bc7cf9193cde06b SHA-256: c08f9d0a0f99c423a33a02bac8150e727785692af5ed370ab1f12b96eb5beba5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically appearing as a search result for 'how much is air force one plane worth'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

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://jacksth.ru/strik?utm_term=how+much+is+air+force+one+plane+worth
    • https://cdn-cms.f-static.net/uploads/4365646/normal_604169596659b.pdf
    • http://everydayy.fun/10931655978z682v.pdf
    • http://bestsalestoday.xyz/ray_bradbury_theater_best_episodesigsv5.pdf
    • https://cdn.sqhk.co/rovovuroj/hjiiOhb/extrapulmonary_tb_treatment_guidelines.pdf
    • https://cdn.sqhk.co/wavudasawete/0rhfMif/racing_motors_for_sale.pdf
    • http://toportt.online/34771238287mtg0r.pdf
    • https://static.s123-cdn-static.com/uploads/4448740/normal_6006752682014.pdf
    • https://cdn.sqhk.co/ninuxoti/5hA2Ojc/46343338317.pdf
    • https://static.s123-cdn-static.com/uploads/4417212/normal_5fcb94f696a27.pdf
    • http://mihetos.xyz/hp_designjet_500ps_driver00mx3.pdf
    • https://cdn-cms.f-static.net/uploads/4420764/normal_5fd22a85208c4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_8e2b322c34764749b8e4823ca75168ab.pdf?index=true
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_65e45272530d40268239d0022c4f2b47.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f5641136-325c-422f-8704-3951472f2ef9/the_princess_bride_free_movie_download.pdf
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_efe1cc0570124cb2a66ca8016362f3fb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/89b9db2b-a90a-4ab5-9802-b8a6859411f9/55226473310.pdf
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_e2d0b52d075c45bfa8189a6d8ab33f2d.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec2b.bin
b9cb530fb04164ccaf6d9f8910c50fa3de6e1eb7ce76bde7b07998006dd0794f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2B 5308 bytes
font_01_sfnt_off0000fe21.bin
993df7cd39dbbf4d8ac9fdfd4d5ac2a61f80a5b703f87d65bf9b8c34a746f390		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE21 10852 bytes

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