Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ba98f2bb5dd7b2…

MALICIOUS

PDF

69.3 KB Created: 2021-09-16 18:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e5f4b5eafffc12441bddd03b447f06e5 SHA-1: 697de62381494ad9ce1fe614638ce77bca3d8c39 SHA-256: 77ba98f2bb5dd7b22c687f320f9d7e1ac5f961df1df055464030a353b48b5ad6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to disposable domains and configured as a link farm, suggests a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://zubrcup.by/files/files/fabetawireve.pdf In PDF document text
    • http://garageanything.com/js/upload/files/32512221953.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/sofowagagibo.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/14371769972.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46474513569.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/66106010505.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/94390388837.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/karomuwufokanojadap.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/45874408325.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/vevobijusozelifimusa.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/zikituboresugew.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613bce10d4042---49979026723.pdfIn PDF document text
    • https://camphacement.vn/upload/files/pawinuvuvibuwipajepodajis.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/34608619645.pdfIn PDF document text
    • http://df-2.de/images/daten/file/gubufofikokajaxanobusifo.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/29778013431.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210913063628_2wv8ba.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/tupalubojafisixikerapu.pdfIn PDF document text
    • http://186086.com/upload/files/pulojedowam.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/34049953998.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/bexesa.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/xuwotetaxazekasagut.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/mijavex.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd8ad58b43---xivafaxodumawibe.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/19404082578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=my+tom+unlimitedPDF link annotation
    • https://lapdonline.org/file/41107037548.pdfIn PDF document text
    • 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_off0000b450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB450 10184 bytes
SHA-256: 37ea996e54009a42d820c8ae0aac8a58d99bd25c02725c519e3599ba9635240c
font_01_sfnt_off0000cb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0C 14664 bytes
SHA-256: 2c7a39d890fd58ca6e6af71daeb05a55b07290b52d9d111496e059bf7a140182
font_02_sfnt_off0000efe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1