Malicious PDF — malware analysis report

Static analysis result for SHA-256 4405ea2e61e7b086…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 17:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dde83f552f1121e7473d041555dec3f5 SHA-1: 1a4bfb4418bd302a19c18f2aebcfcfbb8bee2c3b SHA-256: 4405ea2e61e7b08659fa9b7a685a3ef9ad4ccc07197f3299b5128b2a456beb97
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The high number of external URIs, many pointing to disposable domains, suggests a link farm or phishing infrastructure. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://orthodoxnews.us/file/bugexav.pdf In PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/107506d4df7672a82bf9af5ae14ee4a7/kemewegupago.pdfIn PDF document text
    • http://exosushi.com/uploads/files/17797046455.pdfIn PDF document text
    • https://moolans.com/uploads/files/5504012562.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/17474609760.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/7016970583.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///89417682136.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210914120031.pdfIn PDF document text
    • http://northcity.rs/slike/files/50250965957.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/fagamididudel.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/gikuwubaxani.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/28123083965.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/nejevuruxul.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/31288024996.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135756b2e9bc---nazasinafo.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/15557412480.pdfIn PDF document text
    • http://grabnerestriche.at/6261676416.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/51661665203.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/86704533255.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210909193853.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/lejezanevelafo.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/gineboxi.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/gezonulez.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/gitetivafe.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/kebobawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=swipe+to+blast+game+reviewsPDF 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_off0000d757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD757 10856 bytes
SHA-256: b1a3559d9c1d95dbf4f319aabc8762be0d1fc6bf597e32a8bce13bd2a1689673
font_01_sfnt_off0000f03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03F 18304 bytes
SHA-256: 0b41d9ca5ffca82213f81b0a74192ca5855f12c21424b0a187a3c594854444de
font_02_sfnt_off00011fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1