Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef1f4f1c529df2d…

MALICIOUS

PDF

77.4 KB Created: 2021-03-15 15:43:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7e221d98dab7a7ccbcc400fed84fb5bd SHA-1: 211fc5a406f8d3f1952050e08c30c804bc89401f SHA-256: 0ef1f4f1c529df2da81be8293926f5ed0e5acbf605ee4fe1ed505d51e35ed765
186 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many of which point to disposable domains and are likely part of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dugedepap.ru/strik?utm_term=how+to+put+the+wahl+clippers+back+together PDF link annotation
    • http://hellochildren.online/adp_biometric_time_clock_troubleshootingypc8q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402520/normal_6044d0bb23a51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444369/normal_5feee10abc71c.pdfIn PDF document text
    • https://lewuroluloxujul.weebly.com/uploads/1/3/4/6/134678017/porojedokixoripu.pdfIn PDF document text
    • https://nojabepeteguki.weebly.com/uploads/1/3/4/6/134669956/5325695.pdfIn PDF document text
    • http://potenciy.xyz/what_happened_to_stapleton_in_hound_of_the_baskervilles0qmiy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470405/normal_604a5857f2f57.pdfIn PDF document text
    • http://select-get.top/391913179vv5nw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417312/normal_5fe7fea3cca08.pdfIn PDF document text
    • https://ravuluzezufex.weebly.com/uploads/1/3/5/9/135956854/74158.pdfIn PDF document text
    • http://voiprormul.xyz/citomegalovirus_en_adultos_sintomas6cgks.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_426106a6df3746c0822c12817311076e.pdf?index=trueIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_2d73eac16a4f4c998c88c7586810d5d6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/tovakolu.pdfIn PDF document text
    • https://f459ab6e-ac57-43ce-b83a-1524846427e4.filesusr.com/ugd/938c70_e3aa715f3f684a42b64a04bf116c8550.pdf?index=trueIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_b0a271621b7f491384617c580a2bce2e.pdf?index=trueIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_ffb7dc6420cd4798b3472737dd3dd683.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/the_four_loves_cs_lewis_epub.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/50944327414.pdfIn PDF document text
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_3a11e052f0604bc4b57d93c67e3b65d9.pdf?index=trueIn PDF document text
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_1981a137f9ff4b4f8d4e42249bbc4e50.pdf?index=trueIn PDF document text
    • https://793776f3-68b4-44d3-947a-596ce2c6f652.filesusr.com/ugd/4e977a_01cbd7f0ec1b4fae80bb9e331ce13bde.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wisuw/apostila_caldeiraria.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_off0000f2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AC 5452 bytes
SHA-256: 65fdf0733357985352c081e51bf5a96108c700c7bb8816ea16daa94f24e99b5a
font_01_sfnt_off0001053e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 10384 bytes
SHA-256: f1287f3f12393ae439bc7156a8bdbae73c6b6865a1aa9f13df3fa6b12b1b91df