Malicious PDF — malware analysis report

Static analysis result for SHA-256 7888469df75a5432…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 07:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 96b18784e82e52547c40bed3e6921678 SHA-1: 7cbaaf9eeb0dc951acf599d1c385dcfb6b56d68d SHA-256: 7888469df75a54324b30c2a7a3203d418af2c9392ba594b2f067befef448d191
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to compromised or malicious sites. The embedded JavaScript is likely used to facilitate these redirects or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://wastran.ru/uplcv?utm_term=play+store+for+pc+for+windows+7 PDF link annotation
    • http://pinedafoundation.org/imageuploads/file/29933057141.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/mimonerimapekepizimunumur.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/tapukafedomodatadigewa.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/13898822545.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109082207264367.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021091522252977.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/14688238409.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/36251957576.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/murep.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/pujoje.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/winujiwipenip.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/kinapapawonogikekufiv.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/36453478812.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/86293445767.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5a1657f89---30590287966.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210911203833.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/2723146244.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/subenopogeboxu.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/mituradebogadi.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/pijezebub.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/5124329260.pdfIn PDF document text
    • http://budropol.de/Upload/file/zewabewetujeribezijej.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/10828474331.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_off0000d2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF3 10864 bytes
SHA-256: 464e9d255eee493957b9c439142c8dd746718bfd641e9138d66932d7420eb564
font_02_sfnt_off00010458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10458 17900 bytes
SHA-256: c03b4c4ddb5c7cbc5ceeceaee3d3a7c19c5d7894a0cb81cd8ce40f5504bf6d74