Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d7446ae51b90c1…

MALICIOUS

PDF

87.3 KB Created: 2021-09-17 15:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c44438449d51c7f3b35e6a31dc05097f SHA-1: a03902142fba2a8f63c2b2f541f18ae8da61be53 SHA-256: 90d7446ae51b90c157783641403bbf02fb032036020de19c5893a1e40d796087
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or a scam. The embedded JavaScript is likely used to redirect the user to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://istanajp.net/contents/files/66039086918.pdf In PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/31788682844.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/pupajasavoli.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/e6eddffe3ef5cf0d14bb18eef1102ee4/58099093118.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1630537936.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/mazemuva.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210902055244.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/9935850014.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/20513310127.pdfIn PDF document text
    • http://htygroup.com/upload/files/47687764386.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/luperuzejivipamenopage.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/fufanozijumepuvav.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/lidodotebunatup.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/14814819626.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210910231649132.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/89714510654.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d9df4e190.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/86202678262.pdfIn PDF document text
    • http://viettruss.com/upload/file/kisaxowakitafapobeled.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/romivirumazijaruk.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/28511877948.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/50097604045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=modo+seguro+samsung+galaxy+s4PDF 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_off0000ed27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED27 19040 bytes
SHA-256: e9b58717c1557aec2faafc7e6d16804254736cf29567a0877c926bb35b6c9bdc
font_01_sfnt_off00011f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13723 10788 bytes
SHA-256: 1f7af81ffecb77e67c448ec4dccb41088b9a5126617b4e01db11ce21f103eccb

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