Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f32b716bd91376…

MALICIOUS

PDF

74.4 KB Created: 2021-09-10 05:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8459137a3904d36c2ddf6c059ac17a7d SHA-1: b0e83856c7fb92f6e4768ab66e23cbfb4c9ccce1 SHA-256: a7f32b716bd913764b6306658dee569f0a26abea8a42c062ee5a344ba747a9f3
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF contains embedded JavaScript and is flagged by ML classifiers as malicious. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document's intent to deceive the user into downloading a password-protected archive, a common tactic to bypass security gateways. The presence of JavaScript suggests it may be used to facilitate the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613658e41441a---negeta.pdf In PDF document text
    • http://cmtoolsrental.com/user_img/files/pivezusisozaxoneguzivefag.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/81984636683.pdfIn PDF document text
    • http://szcftz.com/upload/xefusotuliribumitasojimo.pdfIn PDF document text
    • https://clickbox.ro/images/file/lizexagepagugolodebega.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/84453169047.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/74743581022.pdfIn PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/79249171949.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/43486488002.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/80086276436.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/doterukiwifot.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/xojopegule.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/revijibigosumetinanijefu.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/80562939566.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/zegakatixate.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/pojirawotimetoxesewu.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/komakivafozosafev.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/5475a95a1f655aecd78c2f7a3b3662b5/56271096488.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/xujuwagiwowobejas.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/rewat.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/5873932457.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/28286735004.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/14261669388.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/sibud.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/4485331806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=camscanner+full+crackPDF 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_off0000c058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC058 17124 bytes
SHA-256: 912d3876273062b085d805d5ad179f18b3b41153b473a2d44df064caaa087f57
font_01_sfnt_off0000ecb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 10412 bytes
SHA-256: edc712bed0ea697b692a15d1873445f76e2d0a507281771484a72b58d12d46f9