Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be0297fffd0b79d…

MALICIOUS

PDF

72.3 KB Created: 2021-02-28 07:19:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b85c2d8a1cc07207a9bff9d69dae9544 SHA-1: f35603ea817880d64fd9aa55f7b52b9efd0adb6c SHA-256: 3be0297fffd0b79d01af24a3e9f04f84e9b094dce162ef581614bed1a576ea09
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a domain associated with a 'frozen jr script pdf download' lure. Heuristics indicate this PDF is part of a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious, suggesting its primary purpose is to redirect users to malicious content.

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://leonvi.ru/strik?utm_term=frozen+jr+script+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482018/normal_5ff4a112c4cca.pdfIn PDF document text
    • http://options.expert/how_much_is_a_used_bowflex_wortheq2v1.pdfIn PDF document text
    • http://ravigimojamel.mypressonline.com/poxegotosekerafaxakop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366367/normal_601548c5da8f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384472/normal_60035f3e28ec3.pdfIn PDF document text
    • http://vawurabel.mygamesonline.org/35294114854.pdfIn PDF document text
    • http://xibawolafubiz.getenjoyment.net/51209747495.pdfIn PDF document text
    • http://pusokum.66ghz.com/48727965874.pdfIn PDF document text
    • http://com-copyrighit.com/1920452868257ch6.pdfIn PDF document text
    • https://gakafapokizi.weebly.com/uploads/1/3/5/3/135319358/9136652.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417643/normal_5fc83d8e6278e.pdfIn PDF document text
    • https://xojemejavema.weebly.com/uploads/1/3/3/9/133987363/b3805fbeab59a.pdfIn PDF document text
    • https://jidupedepinamup.weebly.com/uploads/1/3/2/6/132680921/08ef86452a1ab4.pdfIn PDF document text
    • http://livetajo.22web.org/frog_dissection_lab_report_procedure.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://piwolimosopobu.myartsonline.com/7900157234.pdfIn PDF document text
    • http://gafodix.myartsonline.com/do_airbags_work_in_rear_end_collision.pdfIn PDF document text
    • http://zalufebali.rf.gd/videoshow_pro_apk_for_pc.pdfIn PDF document text
    • http://zulilosubefo.rf.gd/xorugamegezozozos.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_off0000de77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE77 5320 bytes
SHA-256: 8550e8c769625f0b35306d703777e5e9276871376793f219221742fede574701
font_01_sfnt_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 10436 bytes
SHA-256: a70580977221496d4585d5df315408e44627ebd6142f1250f74b510c0c9b1db1

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