Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa62f3d93756e3e…

MALICIOUS

PDF

92.6 KB Created: 2021-09-19 08:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bf09d13b8f199c20020e319f6786e067 SHA-1: ffb6c96ac3841364c2ff8586be28886e0df60078 SHA-256: 3fa62f3d93756e3eabbd319b1d82ceca85346e1623d3768ea9958aefbc68d4ba
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a large number of links pointing to disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://synerhu.ru/uplcv?utm_term=panda+song+audio+download PDF link annotation
    • https://mgc.to/sites/web/upload/files/28194772585.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/20715696498.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/jabutixovipijusuju.pdfIn PDF document text
    • http://attilacenter.org/userfiles/file/85459236104.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/45946e86de60496af0476b14bbfefcbd/lumelinerobajil.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161344c5d3ed2d---subijalasoze.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/kasiz.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/tuwigajutatukubolosa.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210913214246696670g1pzub.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/lebun.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/65140795867.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/94570449643.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/saranovepij.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/ninavepomokukeruponumanin.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/zumenixedo.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/436843331.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/pagakejit.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/molozesoj.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/widiwabobadukotojuje.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/2628109173.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/76228034284.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/25850408851.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/29355217643.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_off000103f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0F 10280 bytes
SHA-256: 88c29360755f332d4d2be5f2d5f32b5a1454946b7235091846152ff3814bae08
font_02_sfnt_off00013314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13314 19036 bytes
SHA-256: fb03228bfedf4286fef2818f537c2adbcae6c7cd97c74d974befbdc5bc0a13f2

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