Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a00dac8e7eb8ebc…

MALICIOUS

PDF

70.2 KB Created: 2021-10-01 08:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 327657cfa47c8220621e0c4ff3082a4e SHA-1: a1aa2c2b182da13370099dfe5e8469775a152312 SHA-256: 0a00dac8e7eb8ebc7d7af11ae5b0ad146ebd143320ff8af509f4c2ad4077057f
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nnt52.ru/userfiles/file/wimuguzomar.pdf In PDF document text
    • http://syntra.pl/userfiles/file/20173035117.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/76657624885.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/d97e8cfeed1c1e980f5bf3efcb3e6ad2/puvafipu.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161540ba75c5e1---balatagozorufozekiji.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/90661053390.pdfIn PDF document text
    • http://tlcjty.cn/userfiles/aa/file///jifarelapigixes.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/63204965558.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/nifamevetazinenuseram.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/40988297243.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/94675936462.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/42606672435.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/miviraboperodaputegep.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/85500574363.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/50911629340.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/44598511519.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/wuxazizig.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/64969810255.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/peganumezupiwipe.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/kixiwi.pdfIn PDF document text
    • http://voyagerav.com/v15/Upload/file/2021928165044011.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/47491546886.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/lexilepitaji.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/kobimatapuzifibudigabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=apk+fts+2020PDF link annotation
    • 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_off0000b1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EE 9912 bytes
SHA-256: 2af1a7b03d68db0683f6064ce3da2db4482c327a5a44387f8f01f2e746b8bc50
font_01_sfnt_off0000c80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80F 17016 bytes
SHA-256: 4c59aa4426030d602dd0ffac8ab91a338adcedbc6116dd601115c5ac6e1db554
font_02_sfnt_off0000f3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1