Malicious PDF — malware analysis report

Static analysis result for SHA-256 badfbaea74d3887f…

MALICIOUS

PDF

75.9 KB Created: 2021-03-05 03:54:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 900ff8d09b0b14027d54cc2756595388 SHA-1: db1c508734d2ee5abbb441472c53fc01fec3360a SHA-256: badfbaea74d3887fc06f8c3057ebe9d571ffb7ddf788c6e2f2104a0b743643bd
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'kuzutuzo.ru', suggesting a phishing or malware distribution attempt. The document body, though partially corrupted, contains a title related to diamond value, likely a lure to entice users to click on the embedded links.

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://kuzutuzo.ru/strik?utm_term=will+diamonds+increase+in+value PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366017/normal_6008c2de09a94.pdfIn PDF document text
    • http://finuxezanasa.mygamesonline.org/digidesign_avid_control_24_control_surface.pdfIn PDF document text
    • http://zijixiteluwek.scienceontheweb.net/xagemibepodaxadufegam.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/oDjbNjh/bilemu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459166/normal_5fcbe0656f0cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478125/normal_602b087a9d0f1.pdfIn PDF document text
    • http://tuwasukam.getenjoyment.net/ubee_password_router.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/QsBjahd/nubunenutudebebotod.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/how_much_does_it_cost_to_fix_a_refrigerator_compressor.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/knijuhj/amc_30_mesquite_shooting.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403129/normal_600c64e6d6ad9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_b3ee0c0c56f94b77b2c4dd08ffcadf26.pdf?index=trueIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_3039cd42574649a9ae771b53bc0431c0.pdf?index=trueIn PDF document text
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_ca250389174f47b3908103b288b3750e.pdf?index=trueIn PDF document text
    • https://3e80c8bf-0031-4ca1-bfa9-4484641fefed.filesusr.com/ugd/08103e_a04463c02b8c41d5a4b81827ed25b909.pdf?index=trueIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_3a6d8a0f25594d2f85d2ed9524bb31eb.pdf?index=trueIn PDF document text
    • http://pozidijapepore.atwebpages.com/can_you_make_a_smoothie_with_just_yogurt_and_frozen_fruit.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_off0000ec9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9B 5160 bytes
SHA-256: 49203c3f47c2ba7c36e6a80d721f54eb339a7aa21856350557028c0dbcb18635
font_01_sfnt_off0000fe1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1E 10624 bytes
SHA-256: 9e9595bf02592c8210035961b0d4add96b5d97445cc66789c62bec5d3c6134f0

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