Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f400538963b6eb1…

MALICIOUS

PDF

79.1 KB Created: 2021-05-06 23:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 221e3e7abafc3a682c903f5d659019cf SHA-1: 15d79aa6a8d8fa69381c5247dac18a133c56619e SHA-256: 0f400538963b6eb1b46075510502cce48a99efa9ed75b26d3a00cc864b587abe
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to disposable domains, a technique often used for SEO spam or to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/strik?utm_term=how+to+make+a+cape+without+a+pattern PDF link annotation
    • http://midarujiwuvi.mygamesonline.org/kenmore_elite_microwave_model_721_light_bulb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370319/normal_60258d716a895.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409409/normal_60179621cfe56.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/xurix.pdfIn PDF document text
    • http://boraguw.medianewsonline.com/53242041518.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/23356376392.pdfIn PDF document text
    • http://zosazufinur.mygamesonline.org/demography_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476954/normal_600114290c289.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460970/normal_6009da21a9f20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369648/normal_6033cb4b2572b.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/runikoratanusejimeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449618/normal_5fcd09e353a7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_603ff188c9ae1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388613/normal_6040fd3ed0abd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464525/normal_6009877835079.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449205/normal_6044fc44ab2f3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_e106b3f279334ef7a57d41ef4d081cde.pdf?index=trueIn PDF document text
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_e5c56845ae044c60b06d51570ee3babb.pdf?index=trueIn PDF document text
    • http://jonesojawu.myartsonline.com/80682481406.pdfIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_ae57256a540749e1b43bc6b876805b60.pdf?index=trueIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_69621ff6e26b46a9bac67948428f96f7.pdf?index=trueIn PDF document text
    • http://lapetagalelan.myartsonline.com/41396143805.pdfIn PDF document text
    • https://46b09160-81f9-4cb3-9cca-f7b5b0c0229e.filesusr.com/ugd/179cc6_0995d76084de43ec96d3ae9497eac78a.pdf?index=trueIn PDF document text
    • http://terumalok.atwebpages.com/4248031194.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_off0000f776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF776 5080 bytes
SHA-256: 0e173c6d4c7acad85642832f30973fefa778b71d834cc7975297a7e0d674ac5d
font_01_sfnt_off000108a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A1 10672 bytes
SHA-256: 2c776707fd9cceafed641aa63fdde8537965ce88dffc6feccf039b9d5ae8ca7a