Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af5bf0a290bfbb9…

MALICIOUS

PDF

74.8 KB Created: 2021-09-24 05:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6a1ca0d5cd283813d55108c7dad31b09 SHA-1: 859f4bd686d5895be2a5f74b06b403d22fbb1a6c SHA-256: 1af5bf0a290bfbb99114e83f3faba30f43591a0b430ca6313771f8ebe0d4b25a
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is often used to initiate malicious actions. The PDF also functions as a link farm, directing users to numerous external URLs hosted on disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection further confirms its malicious nature, identifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

Heuristics 5

  • 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
  • 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://philabc.ru/uplcv?utm_term=ebook+reader+for+android+free+download PDF link annotation
    • http://studiosantese.eu/userfiles/files/wafujijelorimud.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ee4154ab2---rovakasof.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/natatefabalanizakazivobi.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/xutukoti.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/lozobofu.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/lasadurazinasodovakif.pdfIn PDF document text
    • http://ned.ru/uploads/files/13735899463.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/gewaka.pdfIn PDF document text
    • http://afslab.asia/upload/files/2118467997.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/47225380905.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/relevawelotobife.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/kosojomipudufufutukemide.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091101424891.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/24898802469.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/34831123e84ba4d8668369c22d5c8dff/71586214972.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/34573352094.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/38397371520.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/govedaxososi.pdfIn PDF document text
    • https://fond.ru/userfiles/file/begomo.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/mukovariletu.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/677600641.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/91473506446.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/94328753802.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/49772816865.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/85496144850.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 18684 bytes
SHA-256: 3838928470e3d71418d089b53aaf22e2ae0ecb9071587256e4b24007fdac6b4e

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