Malicious PDF — malware analysis report

Static analysis result for SHA-256 7918a3c32de78c6c…

MALICIOUS

PDF

72.1 KB Created: 2021-09-18 02:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 666e02bef38ad8d4d23157c203eaabf4 SHA-1: 5989a708b87abee976e38830c9235e4293bc6b70 SHA-256: 7918a3c32de78c6c4e337f790b98d28b6d3c4ed61863f706c990beac2ba868cc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one that appears to be a lure for 'update android tv'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of links on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://synerhu.ru/uplcv?utm_term=update+android+tv PDF link annotation
    • https://simpangkanan.com/contents/files/52141891898.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/fezapofakoloximeridubomez.pdfIn PDF document text
    • http://safarang.com/basefile/files/33927266312.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/zobijono.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/2445907203.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/zogewolamum.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/xejijatojew.pdfIn PDF document text
    • http://mebco.ru/images/file/9386348781.pdfIn PDF document text
    • http://grafitym.kz/files/file/1620693441.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/51794100016.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d177a6ebf8---miwaxaxoragekipus.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/munirosukupiziwig.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/69759478642.pdfIn PDF document text
    • http://centromp.it/userfiles/files/43482710472.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/duvedixurupu.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/7228801574.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/gafekatubamotabufipevoso.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/ravuzisogugobutoxi.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/zugaro.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/83017604459.pdfIn PDF document text
    • http://air-ned.com/uploads/files/sidubon.pdfIn PDF document text
    • http://zerosquareonline.com/file/82916523924.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/wemutak.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/kalemisu.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/73717312869.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/91107109632.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_off0000bab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CA 10244 bytes
SHA-256: 05f1d5696fdeb17b2617f595b038380d3e0c636f825584339c88b9b53d0cf2f4
font_02_sfnt_off0000e9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EA 16120 bytes
SHA-256: 34830fee4838eee49ec4906c5658487e910d7cc9bceedaea5d39ee4d9ea9f480