Malicious PDF — malware analysis report

Static analysis result for SHA-256 5230bf7895581357…

MALICIOUS

PDF

75.0 KB Created: 2021-02-16 05:16:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 841c3ca3fd706fff9c6bb1857d2e0524 SHA-1: 7a688769890b8a81bceb84d7d74a51c75d445a1f SHA-256: 5230bf7895581357785cce200e51b5acf0de9c9f7d1aba78dc6b2c2b2eb142f7
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically related to phishing. While no scripts were explicitly extracted, the presence of numerous external URLs suggests the document is designed to redirect users to potentially malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/123?utm_term=simpson+megashot+3000-psi+2.4-gpm+reviews PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463788/normal_601e0455eb45c.pdfIn PDF document text
    • http://magazinrf.xyz/rainwing_wings_of_fire61mjf.pdfIn PDF document text
    • https://suwurivuta.weebly.com/uploads/1/3/0/7/130775320/c2510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480383/normal_601c8a785db84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502870/normal_60057583643d8.pdfIn PDF document text
    • http://kigurumi.org/881841355739c6mn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486550/normal_600a147e2ed93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459787/normal_5fecb8a35f7f0.pdfIn PDF document text
    • http://vwwv-avito.online/bhojpuri_bhakti_gana_djsojnm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496607/normal_6023fe6dc9249.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415291/normal_600fb57b861dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497638/normal_5ffcb9f8377a3.pdfIn PDF document text
    • https://likizosuzi.weebly.com/uploads/1/3/4/8/134886942/3445703.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461245/normal_5ff260c077e26.pdfIn PDF document text
    • https://bezijenogekise.weebly.com/uploads/1/3/4/8/134875893/199b3a4eea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446400/normal_602421cbe1083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391314/normal_6026ee9c73dae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465388/normal_60205b1486b66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420230/normal_601f1157f3ef4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DF 6044 bytes
SHA-256: b98443825b79679f79a12657c20977e8362778f3a433ca4a846170f9e3956fb2
font_01_sfnt_off0000f96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96A 10792 bytes
SHA-256: afa93640d8388fd626e3555c8e84c91393649f207c14fdec373f5039804968c7

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