Malicious PDF — malware analysis report

Static analysis result for SHA-256 590ecd41fa9e9241…

MALICIOUS

PDF

67.9 KB Created: 2021-09-12 23:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: f1545704c0a1d69543de885c2501e741 SHA-1: 25c84a4693c1d0b85b2c1aa151e6000d3ff5b7a8 SHA-256: 590ecd41fa9e9241d52bd8645beff0c46ba74055227bc9dd6dfd374b6c1c2a6e
154 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing lure, employing an image-only interface to deceive users into downloading further malicious content. The presence of embedded JavaScript and numerous external URIs, many pointing to potentially disposable domains, suggests an attempt to redirect users to malicious sites or download further payloads. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://iweldbot.com/ckfinder/pho/files/wojede.pdf In PDF document text
    • https://saikekanglun.com/filespath/files/20210905080858.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/8249121036.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/2669778839.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/13591328949.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/xesokulimuxilefew.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/38557285125.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/83299885702.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/zetoxakimarenofitajaxov.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/23864905785.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/misetexexefugivoxudibadod.pdfIn PDF document text
    • https://granitnet.hu/editor_up/13036775097.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/fotixulukeguvaperesato.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/pinimawizezato.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/tujunogawivemijenizo.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/32957708079.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210909041744975308.pdfIn PDF document text
    • http://selidbe-beograd.info/files/kisoguvilirokus.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/xasakufabegitemenobiduve.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/serofinukazolalawizemu.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/zezorolezukigikikubotow.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/xezal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+see+instagram+private+photos+without+following+no+surveyPDF 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_off0000ad6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD6D 14024 bytes
SHA-256: 519856e563b0fc22e6fa1daa96e5adb0250a0c4814b8db7b405338db9193110b
font_01_sfnt_off0000d00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00A 11160 bytes
SHA-256: 94c16b62be0fab073e2beb728f84147751ed985fd4d9b830e53fc49a011b41ad
font_02_sfnt_off0000ea01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1