Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d2abd6654a5707…

MALICIOUS

PDF

75.0 KB Created: 2021-09-11 12:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: abb7bc5848ec130856274ebb580dc9c7 SHA-1: 29e8555ec1cc1d19ab2027d636dbeaabb03415a2 SHA-256: a6d2abd6654a5707cbb193cdcc51b9a8100220d95f7d6e798904ea9de7004969
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with many pointing to disposable domains, indicating a link farm or redirection strategy. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of many embedded URLs suggests an attempt to redirect the user to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://cuacuonnhaxuongbinhduong.com/upload/files/lipuxo.pdf In PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/jigusetoputitaliraduzama.pdfIn PDF document text
    • http://honda-vo.com/upload/file/wizam.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/78273033691.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/71435886573.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/73346150693.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/nusowedovokegebunadegis.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wobot.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/woxunujesigub.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/87398520813.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/detevadijumibomagefefus.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/821828653.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/jogaxenogemun.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/13943740019.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613137b7007c7---51190276925.pdfIn PDF document text
    • https://thehouseproduction.net/file/demetufasapumaluzedabamo.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/23625589137.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/91932062432.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/36107367102.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/pagudoximajuwe.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/dutafotenuvawugegowab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=is+raw+or+cooked+spinach+betterPDF 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_off0000c148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95A 17108 bytes
SHA-256: 208c333c9f6b1fbe808cba7ed9dbbdc572bc04d18b1b4185767911ebb4351065
font_02_sfnt_off000105d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D6 10836 bytes
SHA-256: 9d7912afb5a203baacc02c0ca4c145b454cdae0a074684ba819986a1948a3967

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