Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8de9ebc2ed783c…

MALICIOUS

PDF

85.2 KB Created: 2021-05-15 19:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 7e9e28ee8c2268b716a9961857189009 SHA-1: 936895ad3129d7ae01bd7ca14a0e144ce2e68a3b SHA-256: 8f8de9ebc2ed783c1e92838bb3f2a5e296fc6e6755f90f118aa70392650b97cf
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting domains, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to exploit kits or malware downloads. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed for initial access via phishing.

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://gimoguvi.ru/strik?utm_term=craftsman+18+hedge+trimmer+blade PDF link annotation
    • http://funewiwawako.iblogger.org/mibitiv.pdfIn PDF document text
    • http://besiditiduw.22web.org/does_trx_help_lose_weight.pdfIn PDF document text
    • http://xuzejomuxide.22web.org/98328053564.pdfIn PDF document text
    • http://rogepexegugujer.22web.org/79903776059.pdfIn PDF document text
    • http://katermore.ru/lt1000_craftsman_lawn_tractor_manualbdkg1.pdfIn PDF document text
    • http://nimened.66ghz.com/4421849696.pdfIn PDF document text
    • http://copyrightreports.com/kuzetoxv9e4s.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/fovezewi/gerund_phrases_practice_worksheet.pdfIn PDF document text
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_630cfcea70db4184b437016652631136.pdf?index=trueIn PDF document text
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_9a5c011049fd48e78d31594e2f216dcb.pdf?index=trueIn PDF document text
    • http://tumofif.rf.gd/96168376790.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/is_nacl_in_h2o_acidic_basic_or_neutral.pdfIn PDF document text
    • http://kelukotezowopob.epizy.com/nudagokekobef.pdfIn PDF document text
    • http://jujewejono.epizy.com/chrisfix_car_buying_checklist.pdfIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_687f2a7a0dbe4eb986d1d9616e45c9d1.pdf?index=trueIn PDF document text
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_a02c87be8eac4e6985538f24d037739d.pdf?index=trueIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_f15cff0e43b1457b8cacd2aca3bd3a6d.pdf?index=trueIn PDF document text
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_a4f81fbfba3148bfa15f42adcacb9797.pdf?index=trueIn 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_off00010e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E28 5612 bytes
SHA-256: 7f87a551cc46ca3af01baa740f9b80df6e39a9f1184d3765d3ea48b7b329c31c
font_01_sfnt_off00012112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12112 11344 bytes
SHA-256: 0263c67e2e713fd34bc1f80022eab498f88ed53c5cf7beee61f42d378f42e8cf

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