Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9fbec2957a389ff…

MALICIOUS

PDF

71.0 KB Created: 2021-09-21 19:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c9fe5c8f62d00cab983fb88bd6c2f01d SHA-1: bf0fcfce365825f3b57fd68b974d4afa9cc07629 SHA-256: a9fbec2957a389ff07c596eb225d9b698ba68acb04090d7eeb84c9a84209ef37
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the URLs, suggesting an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=x3m+moto+friv PDF link annotation
    • https://krossi.ru/images/content/files/38845588164.pdfIn PDF document text
    • http://szjg.hu/images/file/bidetepano.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/zatatu.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/88414421380.pdfIn PDF document text
    • http://anninh247.info/upload/files/bijajur.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613301a731127---91759778369.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/42010167539.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138012e8afc2---rewaxutixerepuxamil.pdfIn PDF document text
    • https://blogsma.com/files/54764538782.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/dejapofivuzawamarak.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/kikewudewapamobadirakoso.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/87986724594.pdfIn PDF document text
    • http://meteoratourismactivities.com/files/files/85165405528.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/51953742614.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/mokivuxiretopodadatut.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/30956113907.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1632215545_2fd06b3e6e.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/subexenonogaka.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/puvupilakufokapajutes.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/punik.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/96811696298.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB660 16416 bytes
SHA-256: 1b769b5a5dd9be4df330cc8469dfafb8dfdffa97af3c78701794c33f9022a575
font_01_sfnt_off0000e0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DE 10008 bytes
SHA-256: 2c0adb4e1ad118f6fe786426ca9fb966752e7bf833f1f5d159040b259e3c7a80
font_02_sfnt_off0000f713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF713 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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