Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bd374b6e11f31e…

MALICIOUS

PDF

71.0 KB Created: 2021-03-01 21:10:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: e71a4867570c5e20b0a44b5ff9664aad SHA-1: 89d0467c350ba5ad1d64b18c54ea8db582ce7266 SHA-256: b8bd374b6e11f31e9477cfd317981ed2fe3ded2d80bafb38ddcd9b98427a22f1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary suspicious URL identified as https://druttle.ru/wix?keyword=chemistry+scientific+method+worksheet. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing trojan. The document body, though partially obfuscated, suggests a lure related to educational content, likely to trick users into visiting the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=chemistry+scientific+method+worksheet PDF link annotation
    • https://cdn.sqhk.co/kepilujofeje/jTohggp/blood_pressure_by_age_child.pdfIn PDF document text
    • https://xabetidadema.weebly.com/uploads/1/3/1/3/131398123/kebuvirona_dudulawuwa_diriremewazefi.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/b9qjg6W/top_10_hockey_shootout_goals.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/vhiWy3L/teacher_apple_clipart_free.pdfIn PDF document text
    • https://vutakajar.weebly.com/uploads/1/3/4/8/134896426/5182797.pdfIn PDF document text
    • https://fesinukovib.weebly.com/uploads/1/3/4/7/134715349/56f8c17ec2fb70.pdfIn PDF document text
    • https://cdn.sqhk.co/kekoseni/b1Pii0t/vozupipimazizemupe.pdfIn PDF document text
    • https://lipijubirenazob.weebly.com/uploads/1/3/4/7/134722159/favisalojusos.pdfIn PDF document text
    • https://cdn.sqhk.co/pibexezases/4hfIcn3/zabexoxoxori.pdfIn PDF document text
    • https://cdn.sqhk.co/linotepibubi/eu7lhcr/fundamentals_of_financial_management_9th_edition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wixatax/friedrich_nietzsche_books_in_spanish.pdfIn PDF document text
    • http://tebafifara.rf.gd/adelaide_benevolent_society_information.pdfIn PDF document text
    • http://dimogotewebi.epizy.com/6607054310.pdfIn PDF document text
    • http://kapetevik.epizy.com/appium_android_test.pdfIn PDF document text
    • http://marilineme.epizy.com/94345480644.pdfIn PDF document text
    • http://sawadosifavaza.rf.gd/jawafaruwutuw.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/bulbulay_video_sabwap.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_off0000da65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA65 5180 bytes
SHA-256: 5a5776269760c357ea786874215eedcdd96438df132ec0c606674ec89a52da04
font_01_sfnt_off0000ebf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF1 10136 bytes
SHA-256: c0e4d6d60f15c2707f3a342ba8ea43324dd1dea48c572387565c3fa414bec8e5

Open this report in the interactive analyzer, or submit your own file for analysis.