Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5377628331708ac…

MALICIOUS

PDF

71.4 KB Created: 2021-09-29 13:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9605984b5b8ad624f402a50d4bdd7198 SHA-1: 2bbe7c3b1a2b528053a61c204b42aee5a2aa4870 SHA-256: f5377628331708ac326629c0e75dee18d411af5acb957cbeb519d88301591757
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to T1059.007, and the nature of the document suggests it could be delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 6

  • 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.
  • 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 http://frigotechreina.com/userfiles/files/69349703253.pdf In PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/xeruxewatigikesugumipuk.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/19599266563.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/daxawofekasirajetofaji.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/49753441764.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/v0e9vpathf2o58mhrhtf44n0p6/bugukupepurubapubimur.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/kikijajesizijejefasovidur.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/67495662084.pdfIn PDF document text
    • http://hanifeugur.com/image/files/lewoparowirolakur.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/gatuxukujus.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/48926130318.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/9a1b11988ce9478550132ec5df7494ff/55605537462.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/gisinadewobakog.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/7040962126.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/bunitezanufuwejunoro.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-23/20210923124959176007.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/gibazobitoxurukawi.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/nafesutezerezewetumasose.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/razizamodadiloruxef.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22624965151.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/61295239601.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/89159341653.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/26225440393.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/72223757117.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/jujisonuxizafeseten.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/34115700709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=intro+maker+outro+maker+intro+templates+mod+apkPDF 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_off0000b3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E4 16976 bytes
SHA-256: 6a336e720ec92cd98b61a5a8d11e3f3bf8464e5e88d2771e5e63ab84725b0a9b
font_01_sfnt_off0000df58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 10696 bytes
SHA-256: 2077d252223fe5ec03bec7330cc9ab6b6e72e5d071eaa2cfdd0d69180b533b3c