Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb199ca3c4e65407…

MALICIOUS

PDF

84.4 KB Created: 2021-03-05 10:42:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d880fcfe525023af6bb163a153d21a7e SHA-1: 14b80d32056a874dcaa70460faaa2c54f5535160 SHA-256: cb199ca3c4e6540708e480cde0157be86f44d7a6639a50ece2a2c2de336ba289
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. The document body, though heavily obfuscated, appears to contain keywords related to movie searches, suggesting a lure to attract clicks.

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://soxebez.ru/aws?utm_term=the+stand+movie+1994+watch PDF link annotation
    • http://conicppjry.bid/9631213978xka84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370767/normal_60053f0dc686a.pdfIn PDF document text
    • http://belkwigs.com/goseladudumesunozudep0moyr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481400/normal_6033f65ea7812.pdfIn PDF document text
    • http://domavera.ru/969908292730ythf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419654/normal_60001e1bef662.pdfIn PDF document text
    • http://sks-expertiza.ru/relaxing_classical_music_for_sleep_youtubeljisv.pdfIn PDF document text
    • http://hermidkovo.info/gujusufifebogiwng4dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414494/normal_5fd3084329ad4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425235/normal_5ffbc546c9ccf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_0a4361f5ca7f4ff08d0f08b9c26d5dd3.pdf?index=trueIn PDF document text
    • https://83f018a0-8e49-44f0-b57e-805e464a5f06.filesusr.com/ugd/10a4aa_d4059a5f71044180bcb0243c446b4f38.pdf?index=trueIn PDF document text
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_0d18619cb351473e8f8d3ecce0c20949.pdf?index=trueIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_181d29986f7b488eafaf646ba0973cfd.pdf?index=trueIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_0656592b4f3d42a0b19c1b160a4965b6.pdf?index=trueIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_6b61759498aa449487f0347e3bb83b80.pdf?index=trueIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_472b6366205844d0ac56f2bddb30fd6d.pdf?index=trueIn PDF document text
    • https://4c5ad993-366d-4b3a-aa99-9b6f56583180.filesusr.com/ugd/01e791_6459db63c2ab4937a0636f214cf1b982.pdf?index=trueIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_750b3ff5cb97430ba54ab75f4dc3f8e1.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_off00010d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1A 5448 bytes
SHA-256: 2f58dd84cfe28f7d67bd82fcb90d0626a6b63aa0c7faef92fd6d42e5939bd22d
font_01_sfnt_off00011f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9C 10912 bytes
SHA-256: 0db475b49b9ee4cdfd049417af882c7378c36595d37fea9ef77ed3318a3b4cdf