Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a26bbbb5d84cd3…

MALICIOUS

PDF

84.4 KB Created: 2021-09-12 07:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c9e621f2a2b5e97d2b3c44eb98bd758a SHA-1: 715ca93a675006daa7e9e68d31aa8fc53554f293 SHA-256: d1a26bbbb5d84cd360cba4835f4cb1624be30fddb06ff5cfe5ac8adfabdc185b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also includes numerous external URIs, many of which point to PDF files hosted on potentially disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the redirection of users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=must+apps+for+android PDF link annotation
    • https://isigakizima.net/img/tmp/file/rulupiwetisob.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/38950683439.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/dce259b5795ca17f94820ab349cbb355/83979646764.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d66623a00a---kodifexezozeregetololon.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/fivotusomatavesev.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/5161476358.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/bikodudetivirabokitevar.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/16458365129.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/83155250659.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/zeberusumufipirurolesizi.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///gilazuvosuburo.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/53955859088.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/fapemipenemefijere.pdfIn PDF document text
    • http://guitarenko.fr/img/files/xubiwamidujeligususatamup.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/58760233427.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/53703278442.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/90856312886.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/nafimebaresafoxit.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/xekazukitefebumorejasa.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/4958784510.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/67661105166.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/koxebuluw.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/kugugepezigezorasazin.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/82024217063.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_off0000e5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F2 10408 bytes
SHA-256: ba03f92357d703ecb58d138b5fa84f7c3b60972fd99050ac75a0c45ed1bcebda
font_01_sfnt_off0000fda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA0 17820 bytes
SHA-256: c4e891570b1ba4afa20ae02edc4316bae7beacd0f249aca03a7467024e0a3538
font_02_sfnt_off00012bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1