Malicious PDF — malware analysis report

Static analysis result for SHA-256 9085e7d9ea921d1d…

MALICIOUS

PDF

69.0 KB Created: 2021-09-14 03:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 21fccd0f77c95ae5c11d4ae26211b9c7 SHA-1: 6eaf76088a49d35797641065c58eda84b6163b00 SHA-256: 9085e7d9ea921d1d3c3fe4a23f7fb5d80ddac18cb067b2d19e3f9820312c0e04
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The PDF structure and the presence of many external URIs suggest it is used to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://keemunblacktea.cn/uploads/file/021731579582.pdf In PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/25914203048.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/34929117768.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/jewejosigozefumomo.pdfIn PDF document text
    • http://manenshop.com/upload/files/veduter.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/fofubinijalorukixapuba.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/wozejudimiso.pdfIn PDF document text
    • http://suurelepa.ee/data/file/rejolo.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/3826344034.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/74866310544.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/dumekituxidi.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/pezopaworilegisuzogexenor.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210906112209.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/52422931195.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/nuturexelal.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210913115047.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/459959936.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/vuwekotis.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/57528317212.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/66301502421.pdfIn PDF document text
    • https://dm288.rs/slicice/file/42665439602.pdfIn PDF document text
    • http://htwy.com/upload/file/gotonuwufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+factory+reset+mobilePDF 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_off0000b256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB256 14288 bytes
SHA-256: 1d3435ed016582420344218e601d174239c30cc9119b9d20289f32bcc671759f
font_01_sfnt_off0000d5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDB 10724 bytes
SHA-256: f7cd474930c10dba9a3ef1380bf64122275081e72c522a13027d88c0227f6872

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