Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26478625732640c…

MALICIOUS

PDF

79.4 KB Created: 2021-09-23 22:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: da99602cafd6fe1448111277a2b431f7 SHA-1: d6dda155c53bd2bce6d874d523ff6f703b51f89e SHA-256: a26478625732640c8a6f13e860d9556d79ca49c6c77727dfd4a5d15d10f333a9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://allytemp.ru/uplcv?utm_term=can+i+increase+my+ram+in+android PDF link annotation
    • http://mrcubezpieczenia.pl/app/webroot/media/files/64935497556.pdfIn PDF document text
    • http://quranday.org/userfiles/file/2447053522.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/kuvalepas.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210913035922.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/vapovafe.pdfIn PDF document text
    • http://skupka23.ru/upload/m/zodozobajurove.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/86856509203.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/redexotogozep.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/4a5abedujf6c6hjm8g5o5mpkc5/fefakupijudivabewaleko.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/wiloverumerimo.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/481354341.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/selewinubajujizujiti.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/pebulegufi.pdfIn PDF document text
    • http://vinhthuan.asia/upload/files/togosizinotesesidoreperu.pdfIn PDF document text
    • http://huiking.cn/uploads/file/151814293172.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161467403c6047---5624257434.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/47807811528.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/99246873049.pdfIn PDF document text
    • http://preiss.at/upload_files/files/xonavipomagavuzudoju.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/kazasoburuxuzufejuwiga.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/debezofikepibij.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/xalukikopezanesenoteko.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/44768393536.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/27198053078.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_off0000d45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45A 10532 bytes
SHA-256: 10835dcc75d79ecc64a72ffb72d92e81810c9a052be8fd871444a93f8207b221
font_01_sfnt_off0000ec5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001046c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046C 16976 bytes
SHA-256: e5a61e0da8a5bac096e9ad8a8b7e2b50434d9173a6b15f6088ed7c9d58b1f233