Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9d6d7cab3b0457…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 11:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: caa638c60790d4c41b22d5916a3c611a SHA-1: f40eebc8f6af4a0f059d0ca27808c22f47120b87 SHA-256: df9d6d7cab3b04576dc7e2550cb4a1bb49c4b77e2665f8d1226d1dbc6af75bba
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code. The heuristic firings indicate it's a link farm designed to redirect users to potentially malicious content, and ClamAV identified it as a phishing trojan. The embedded JavaScript likely attempts to download and execute a second-stage payload or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://ggbris.com/slbdavbatala/userfiles/file/68796144943.pdf In PDF document text
    • http://feynburg-uhren.de/uploads/73805319810.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210909_AA2E9C61317D362D.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/48304930127.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/80156838325.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/devuluzakokozakiwabor.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136f465995d7---15965767113.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/mewomutevevomode.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/1329810899.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/salezaxopu.pdfIn PDF document text
    • http://birdwatching.sk/media/file/49930059418.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/xirovawibefoxezedaga.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/sazos.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/72967275343.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/84828361406.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/95107013733.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/66079495918.pdfIn PDF document text
    • https://hojoairport.com/images/file/vigidavagowubugurer.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/kutikapujikixu.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210901163805.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/jagonoxudikewadusameto.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb891109da---juxudufofarufexus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=mouse+toggle+for+android+tv+1.52+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_off0000d2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B7 11296 bytes
SHA-256: ff8f48403f8fee6beacd26b08982baacbea7022f45eea14068ca293853cbb8fa
font_01_sfnt_off0000ed5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10571 19904 bytes
SHA-256: b1c3c8a9721df715b962dbc0c15c064f5b39a14f4a8ebfd80634ee96166050c4

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