Malicious PDF — malware analysis report

Static analysis result for SHA-256 89794568de654e6d…

MALICIOUS

PDF

73.4 KB Created: 2021-09-15 14:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18cff643cb6e3c3cb88402bb42184296 SHA-1: cd8a4c165d872465d411d74b3bb897af05db5f31 SHA-256: 89794568de654e6d25a4fc582205ac932a381f3bee4d72526716f430f9d9e153
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely to redirect users to malicious sites. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme, potentially leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kaowei.tw/image/files/20210910_081558.pdf In PDF document text
    • https://mccartha-cobb.com/userfiles/files/71054857490.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/92426680562.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff47d98eef---wupifarakepatefal.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/38925935562.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/97231064793.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/tukizejok.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/nawajebasatolerevivamu.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88550893524.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/givumulamuwuloraj.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/48972348069.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/nagunimutupivamit.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/lixokemolow.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/bafera.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/1063762420.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/86811231383.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/33032808822.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/lewup.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/gotetifovonadurasazunu.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/zexutomox.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/f93fbda17042c2786b30cbe89b05c119/nubazubekogotiradiniweru.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631577678.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/36495556997.pdfIn PDF document text
    • https://jin-ji.com/upload/files/miviledapubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=white+heart+emoji+copy+pastePDF 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_off0000b9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D2 10728 bytes
SHA-256: d8ae52512e27c57d8832883f1ce5285c2a664c0e600eab937cd8c3d390f5748a
font_01_sfnt_off0000d27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27F 17672 bytes
SHA-256: feb6ee12d534c75d99f696cc35ed7c9f6dc8cbd1295d51918785f21264d7c7b9
font_02_sfnt_off0001004b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1