Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e12485a164d0d4…

MALICIOUS

PDF

80.9 KB Created: 2021-09-09 01:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f5e14bea9f40dce96021425aa498d86a SHA-1: 06af6c9203b2ccaa940d4e17dff1cc564cf5973b SHA-256: f9e12485a164d0d4aa1bf4fd96e5cfd66ff265dfdeecea6c8fafcb36863c8ada
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The document contains numerous URLs, many of which are hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the link farm heuristic strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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.
  • 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://ccaquebec.com/userupload/files/tobinadagogijejikesij.pdf In PDF document text
    • http://ilovechardonnayhills.com/userimages/kigenapefakatanum.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/vabovamelolasadokikile.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/gawominasugupavo.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/98299603748.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/74453412127.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/larofifulagajofaxa.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/71224042058.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/64576557507.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///ratuxe.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/bezovewulinik.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/30056980204.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/janoliwugavujepiloridez.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/11636003557.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/83571671127.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/padunovubetura.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/6892233526.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/ruwedegi.pdfIn PDF document text
    • http://shahgrp.com/uploads/fovuxoneniwutozamegimute.pdfIn PDF document text
    • http://abnicum.ru/files/file/venafasapakiliwiwipot.pdfIn PDF document text
    • http://polipack.ru/content/file/87530817868.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/efce20f48801fa2b6b9f92ec28a5a9e2/visolalimegunopisona.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/bejotosibeganokofusizekop.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/80175317035.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613315a7dbcab---bekuzopumubumomev.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/paviwedamijevosukabixan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+restore+sms+messages+on+androidPDF 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_off0000d9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E1 10620 bytes
SHA-256: 9149a951d4fc3140c7080df876d8f9df5edf4ae5950beb7d9cba9bdeeaba7001
font_01_sfnt_off0000f1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 16648 bytes
SHA-256: f95aac2abf62f7efa794b35a37e615c8e8ff15053d240bef29ba11d92ae41c51
font_02_sfnt_off00011d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1