Malicious PDF — malware analysis report

Static analysis result for SHA-256 630cd547cf6accde…

MALICIOUS

PDF

78.3 KB Created: 2021-09-16 19:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5cfe7494e521c1366b9dcc68bc217527 SHA-1: 1aa68ae4483b3ce86abda4f44d99cbbcca7a7ad3 SHA-256: 630cd547cf6accdea641d6441568b82019f3e41d2785fe156b0a2680634d91fe
166 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it is a social-engineering lure, specifically prompting the user to install a browser extension or update to view content. This is a common tactic for credential theft or malware installation. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/fad4f76397c930004a85f6ee54402bcd/9730452841.pdf In PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/gafuposalufe.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/xavirakakur.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/sofewozolenapuwo.pdfIn PDF document text
    • https://dm288.com/slicice/file/61639539607.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/35249908820.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/vevagadomudededes.pdfIn PDF document text
    • http://ladna.pl/user_images/file/raxusu.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/69290370848.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/57901116688.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/mujilumowejexugunikumid.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/4370030828.pdfIn PDF document text
    • http://beta-rc.com/upload/files/65185559438.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1630989676.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/69378213990.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f444db737d---14670913866.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090306122870554.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/37574835022.pdfIn PDF document text
    • https://thehouseproduction.net/file/72614696895.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210904_F30BAD3332B042E0.pdfIn PDF document text
    • https://premium-house.uz/images/file/41790098227.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/55710376058.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/wobujuxigolezezego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=taptap+vpn+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_off0000d034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD034 18176 bytes
SHA-256: 119c8b707817e853caf68a224104a73119859d36937841374a7cdb33705b2769
font_01_sfnt_off0000fea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA2 9708 bytes
SHA-256: b8ebb16e9f435b79b1d98be98916db14e77f6753eda90ac34eb138babfeb40fb
font_02_sfnt_off000113f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1