Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5c3eb07675eef4…

MALICIOUS

PDF

72.8 KB Created: 2021-03-01 12:05:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 911e7a1d7d1213d7dff7472acdce9a66 SHA-1: ec8eba89f4c4cf7c72ca68494edd4fdebaf32f5f SHA-256: 5e5c3eb07675eef4eb01bb973c6c508eaa5bc3017c007c7811fa91597858bf38
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm by heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, with ClamAV specifically identifying it as 'Pdf.Phishing.Trojan'. The presence of numerous links to potentially malicious domains suggests an intent to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/award?keyword=lexus+gx+460+lease+2020 PDF link annotation
    • https://vawevoza.weebly.com/uploads/1/3/1/4/131482963/3c5b6505b9754.pdfIn PDF document text
    • http://hyipinvest.site/daniwugetovenumanetusav8w5m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421330/normal_600fbb1fdf61b.pdfIn PDF document text
    • https://tugixafebav.weebly.com/uploads/1/3/2/6/132681891/eb8e229.pdfIn PDF document text
    • https://raromimuzu.weebly.com/uploads/1/3/0/8/130874361/9422680.pdfIn PDF document text
    • http://teplotronic.ru/homeschool_attendance_recordt6bdv.pdfIn PDF document text
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/7449335.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393485/normal_5fe8e2e3e18a6.pdfIn PDF document text
    • http://4bochki.ru/icom_746_pro_display_problems3xrcs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388274/normal_6014d973ccf64.pdfIn PDF document text
    • https://mepurukog.weebly.com/uploads/1/3/5/3/135306658/7008935.pdfIn PDF document text
    • http://udilische.club/unearthed_arcana_ranger_dndbeyond3kbon.pdfIn PDF document text
    • https://jajibesuwazigix.weebly.com/uploads/1/3/1/3/131383486/dadevok.pdfIn PDF document text
    • https://sozamevojor.weebly.com/uploads/1/3/5/3/135309273/pajukurejebegax_xulaxibiw_rokivivekafu_lepakizidufo.pdfIn PDF document text
    • http://ctyr.ru/44826162588czv7m.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_off0000deb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB6 5280 bytes
SHA-256: 62615f81610354412a993d57852a537730d0fec4b5204e6f3c189259796b2df2
font_01_sfnt_off0000f0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 11008 bytes
SHA-256: d7bdbad849e07eb699bfa539d664618bc23e9983cb39a8b25089c2f8f22e4014

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