Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeb25528da595d17…

MALICIOUS

PDF

67.7 KB Created: 2021-10-01 06:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ca8329e92c135a2bea9ac58608639b77 SHA-1: f011129da0b5840969e9200627131447a0a74157 SHA-256: eeb25528da595d1799107535830c6b305a96dad1730a9f57049085c479e628ca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a phishing lure due to its small size and image-based content, typical of a screenshot designed to hide clickable links. The document's structure and numerous external URIs suggest it functions as a link farm, likely directing users to malicious sites for phishing or malware distribution. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://krisoc.ru/uplcv?utm_term=snapdragon+new+processor+2020 PDF link annotation
    • http://ledseoul.com/userData/board/file/kadamaz.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/jurivuvobet.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buvewi.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/lufejojamotiba.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/18265798493.pdfIn PDF document text
    • http://netflor.pl/upload/File/29713905534.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/boxufutumesosaji.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163155012533.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/78471183140.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/gifejuzepenekumizul.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/teruwafobosobe.pdfIn PDF document text
    • https://kameramuzesi.com/upload/files/85550283332.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/80963574255.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/vobepasamodegabu.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357a2f0c99a---kimosategifowukebobosebo.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/bijefinixawetuwad.pdfIn PDF document text
    • http://apismorava.eu/docs/8236086612.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/27026689803.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/75170636097.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/95208750848.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/46421279019.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/74aaa5b7d33c8ebeb90ff4feca6a6546/bopovikilaferuniji.pdfIn PDF document text
    • http://usateatop.com/_upload/files/75511426699.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_off0000ad49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD49 14140 bytes
SHA-256: 3fc5b1bc20d9a24425103c4d8db3479581c8b0c2b6c0dfb3cea5da3b6655c9ce
font_01_sfnt_off0000d0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 10856 bytes
SHA-256: 9aba7bb189dbe7bebca22a186baee7ba251910f27099af93359a35dcead35e13