Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5335138ca229411…

MALICIOUS

PDF

85.6 KB Created: 2021-06-06 11:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 38e9507e05b25ab173e0ae23c2cd2fde SHA-1: 045fd825ff332009b6d1d6e02e9b0ab7a2c848b6 SHA-256: c5335138ca2294114903220b824ad3bb09e4af5dc46981b90c9d1e9d8055af43
126 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. The document's structure and the presence of many external links suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://philabc.ru/pbw?utm_term=head+ball+2+legendary+characters PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4469847/normal_60b77e7dca09e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485568/normal_606929c771a31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403936/normal_60511cde422c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374185/normal_5ffe436cd3477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401973/normal_6063d1b94bd71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481988/normal_6025793b9ac9d.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://fipivuzigoge.pbworks.com/f/gaduvuvaleduzijukerilol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/078b7902-dcd1-467c-9d8f-2ea8dd1a6440/51658513254.pdfIn PDF document text
    • http://gufikugefisu.pbworks.com/f/29695892029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95c060f2-6354-41c4-a759-7074a27e8ba5/20697991786.pdfIn PDF document text
    • http://mukonisu.pbworks.com/w/file/fetch/144446796/mimepuwel.pdfIn PDF document text
    • http://midevodimu.pbworks.com/w/file/fetch/144714066/coin_master_cheat_engine.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/w/file/fetch/144487344/giwipulofajutemobesezop.pdfIn PDF document text
    • http://finatin.pbworks.com/w/file/fetch/144568890/what_is_contrastive_analysis_in_linguistics.pdfIn PDF document text
    • http://fawugomem.pbworks.com/f/best_story_saver_for_instagram.pdfIn PDF document text
    • http://lesokulovisu.pbworks.com/f/big_ideas_math_geometry_student_journal_answer_key.pdfIn PDF document text
    • http://pilujibos.pbworks.com/w/file/fetch/144622653/how_to_plot_roc_curve_in_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/412d4ece-bf37-48d9-8ae3-61e4ea75b2be/dowozevujitupavefofokun.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04D 5164 bytes
SHA-256: 9fc2eef7a43d478b385a9d99b5a6e58280a1766626e97c23d095fa6da76135d8
font_01_sfnt_off0000f1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C4 3172 bytes
SHA-256: 43765b0144058609f0632700887493c4774cc4865be77ddd529fced69f45b098
font_02_sfnt_off0000ff43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF43 10672 bytes
SHA-256: 0cd62f956795c70b74bb6f3dfb28c719693b6bc4a800b05a0bbcb85b3afbc6cc
font_03_sfnt_off00012433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12433 16376 bytes
SHA-256: f2691f1f07efcdc1f1704d05371d97b6f857faffd0327b2b03576134d540ec14
font_04_sfnt_off000139f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F7 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333