Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4dfbfd57ffe412…

MALICIOUS

PDF

67.8 KB Created: 2021-02-24 04:43:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 0b2672b107250cb64529a743a1f1b913 SHA-1: 5ab2f8840e91d63f7fd5ac84777a50147419e9d6 SHA-256: 0f4dfbfd57ffe412306deac653f43b639bd039205f876152513ed6303bc680e0
66 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by a machine learning classifier as malicious. The document body, though heavily obfuscated, suggests a lure related to 'computer repair course free'. The presence of numerous external URIs, many pointing to disposable hosting, indicates a link farm designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://seumenha.ru/123?utm_term=computer+repair+course+free PDF link annotation
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/lenapazur_dujujopegij_vodijidubujigug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366325/normal_600c41acc95eb.pdfIn PDF document text
    • https://pevolevu.weebly.com/uploads/1/3/1/6/131606362/971534.pdfIn PDF document text
    • https://xapitutas.weebly.com/uploads/1/3/0/8/130813648/7238440.pdfIn PDF document text
    • http://jitudujugizewo.iblogger.org/how_to_start_stihl_ms_170.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464865/normal_600ee0eeb4ea7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450141/normal_602b395884909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464877/normal_603066662510c.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/zosevid/50981139352.pdfIn PDF document text
    • http://kamiwivexa.epizy.com/tapejagu.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/fedesazo.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/1824796785.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/vinozevijanobigixopo.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/36595006502.pdfIn PDF document text
    • http://tibibexubedumu.rf.gd/24366678708.pdfIn PDF document text
    • http://majojevonomofu.rf.gd/760742373.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_off0000cef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF4 5036 bytes
SHA-256: 1dc6f279258067aacd79fb63de6ffb06692ab44eef0b8e8622d538c637af4225
font_01_sfnt_off0000dff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF6 10228 bytes
SHA-256: 43058e7c03ac6317b6933bf8667042e4a31883afe94b82383b65985e453e3e13

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