Malicious PDF — malware analysis report

Static analysis result for SHA-256 69310db330896fdc…

MALICIOUS

PDF

73.5 KB Created: 2021-09-18 17:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 20c7aa2965532b37cbdc074ada921c9d SHA-1: 3a29bd6c34e11bfe8afcb90940743d0a8f504561 SHA-256: 69310db330896fdc4a845647fde98963977450edd6243c3d43f751ae1a2a6860
134 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains a large number of external URIs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=city+car+driving+download+apk+pc PDF link annotation
    • https://matagujrischool.com/admin/imagetemp1/file/fakufo.pdfIn PDF document text
    • https://clickbox.ro/images/file/koposawomozurob.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/giximuzesaluwutusowe.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/29893473409.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161443d37dfeca---12260608564.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/tofimeju.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/retukudusaxuredezun.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/nugomegofukojovunezuxuv.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/bajilevadosabakani.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/lawabizaxebegos.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/60539067009.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/25452374197.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/fomozavinigupiwegiwote.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/35051531632.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/dobatajiwam.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/sivepitipozeko.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/kurozedazina.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/61770829158.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/pejonokum.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/58055680711.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/dopir.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/33430375788.pdfIn PDF document text
    • http://med-os.com/user_upload/file/kesikikofejuzegodajusexet.pdfIn PDF document text
    • http://byecook.com/ckupload/files/potepuxoxunorekesuzejowen.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_off0000bbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC7 10780 bytes
SHA-256: 73489cd0f733718f0fb335a7ed9378d196b65c074bb69944359e9c26c184d118
font_01_sfnt_off0000d496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD496 16956 bytes
SHA-256: 0c095c1c2698a667eecb18909f8d706a3b50df8543a85db6269c8d038b14430c
font_02_sfnt_off0001005b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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