Malicious PDF — malware analysis report

Static analysis result for SHA-256 02ef9f5562402b9c…

MALICIOUS

PDF

78.5 KB Created: 2021-03-26 11:42:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 062c1a130a52449ff059069b8d57c2d6 SHA-1: c88c402075f4f5a2e575168f0ca994bc049bac4c SHA-256: 02ef9f5562402b9c96eb494fc516af64c021775a6e090bed2f96e05cba515345
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kuzutuzo.ru/123?utm_term=visual+identity+template+vector PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450147/normal_6037c2da5a8c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453732/normal_60004a049e429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420037/normal_60557e608de0a.pdfIn PDF document text
    • http://dofegogojewipo.iblogger.org/fixulipo.pdfIn PDF document text
    • https://walowopus.weebly.com/uploads/1/3/5/2/135295279/zilibutasemamo.pdfIn PDF document text
    • http://sofofal.iblogger.org/texemobeda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425759/normal_604954824ac06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491426/normal_5fde6e70347c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480735/normal_6044215a0a06c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424040/normal_5ff0ec5ee9131.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425514/normal_60051936b6172.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419847/normal_6026a54557a7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413235/normal_600e77b2bc0a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412899/normal_6003979e46049.pdfIn PDF document text
    • https://sowimarigakuni.weebly.com/uploads/1/3/4/7/134705136/kivinope.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501204/normal_603fe76dbb557.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464865/normal_5fcba221b1f60.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pelasezota.rf.gd/45995238224.pdfIn PDF document text
    • http://xetulugesoboko.epizy.com/formation_windev_mobile_20.pdfIn PDF document text
    • https://ee67c5b3-b4d3-4257-b425-af55881d3a68.filesusr.com/ugd/c60da7_f6a612ee896d4817b42a495791b27b59.pdf?index=trueIn PDF document text
    • http://magikid.epizy.com/nuages_debussy_sheet_music.pdfIn PDF document text
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_81b4c3d9407e49c48b2121ae2af3cc8f.pdf?index=trueIn PDF document text
    • https://2a26c5f8-c4f8-4af8-830b-7e2c9961bd8e.filesusr.com/ugd/2e4362_543e8e12a6c94d9aab9213491d4a2f11.pdf?index=trueIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_71f1331faacc4a578393e4b0b25a7f48.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78D 5228 bytes
SHA-256: 3904f7f723714562b49e4f9dffde49817199352bec78227364544559fec33800
font_01_sfnt_off0000f93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93A 10972 bytes
SHA-256: 3d5bb4a841340c3289855a106ef01e1141cd33fbd208d5b477a24f15876f6ce4
font_02_sfnt_off00011dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFE 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230