Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a4c7f0e749f4bb…

MALICIOUS

PDF

67.3 KB Created: 2021-09-10 10:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: b3da0d7cb268a5ddad1934ccdc94107e SHA-1: 58e2485c4c82dc6eca897a6cc1e3037fed95181e SHA-256: e9a4c7f0e749f4bb1a7b9f6be1010462f30d46f7a68347ad06b87d58e5f49b65
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-only content, typical of a screenshot designed to hide a clickable link. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

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://inannamsao.com/uploads/files/74680281861.pdf In PDF document text
    • http://ecolservizinettuno.com/userfiles/files/98592294544.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/88246288903.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/8338934723.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/35617709909.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/salok.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rixemogakiguniwekoviki.pdfIn PDF document text
    • https://x-software.cz/data/file/lasejo.pdfIn PDF document text
    • http://tulga.ru/editor/files/72853584183.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/75138990578.pdfIn PDF document text
    • https://norservis.com/files/files/duromedovutotosowabal.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/soxuk.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/lovurupebivogatem.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/9003501489.pdfIn PDF document text
    • http://rideco.hu/upload/file/96335811508.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/5307938234.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/66434551377.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/donosewozipavi.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/dinedared.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/vosep.pdfIn PDF document text
    • http://mfahk.com/upload/files/71143512578.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/derowukug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=illegal+sports+streaming+sitesPDF 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_off0000ada0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B2 13920 bytes
SHA-256: bd0d10f91ff2523e8aae25203f4ee52c6f730e38195d1e0aac86e7bd9b36b668
font_02_sfnt_off0000e814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE814 10544 bytes
SHA-256: c1ea3162d6880abe89b651202c5072a29d10f12d488217ea61651aeaf25ffbea