Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd9865645ef872c…

MALICIOUS

PDF

101.5 KB Created: 2021-09-16 19:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a2c44036cca504f24cd01c8c719cd3ea SHA-1: 3ee35251feda5ece7c10f011acf2a22a8feb09f5 SHA-256: 2dd9865645ef872cb82191d07b8c80969140036afa79e8a99c4ff9d7e7d125c5
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and contains numerous embedded links, many pointing to disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution scheme. While no scripts were extracted, the structure and numerous external links strongly imply an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier clean score 0.1206

Heuristics 4

  • 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.
  • 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://coretry.ru/uplcv?utm_term=best+nfc+writer+app PDF link annotation
    • http://chafewyuok.handysociality.com/upload/files/xarixezetolijosoj.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/ruwunijem.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/bebezamitipoj.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/zokom.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/86562192960.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/031258013398.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/nutomisumu.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/43613891369.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/34128487232.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/248723466.pdfIn PDF document text
    • http://rotang.net/userfiles/file/18307267946.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/76213354608.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/noxuzo.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/81583644675.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/10685115383.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138a45e01d50---fevakixafafekezopuselelix.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/genonet.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/bewonewovomuxajofasu.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210907_2EA92C734D8EF597.pdfIn PDF document text
    • https://redac.ch/upload/1973607920.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/kikepuropurimifuwew.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/rufeketipadit.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/39831183032.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/71713199860.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389f97b71f5---jibonimawavedowuve.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/17275602853.pdfIn 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_off00013693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13693 10448 bytes
SHA-256: 2af81236e3d5107d4b91b300b5e45ecebf56443afb78b713b3f6aed081352ffc
font_01_sfnt_off00014e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E82 19008 bytes
SHA-256: 089b8e2a976d66185033f076f30825571b258e95cdf5ad973982d6dc9e8fd581
font_02_sfnt_off0001811a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1811A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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