Malicious PDF — malware analysis report

Static analysis result for SHA-256 e46e5c4579b83a27…

MALICIOUS

PDF

68.2 KB Created: 2021-09-24 14:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: db800ab4d0c4e97a82cc7a1cf666281f SHA-1: d64d9596f0a146247e9bbd34835131dd329c4688 SHA-256: e46e5c4579b83a27650bfd038cd10a6eef5d269e5151429237fdd31cecaf431c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and numerous external URIs, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, but the presence of a PDF_IMAGE_LURE heuristic indicates it likely presents a visual deception to trick users into clicking a link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 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://vakantie-noordlimburg.nl/ckfinder/userfiles/files/75325525272.pdf In PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/galarezejukalidipalawu.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/72463227673.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/41826063059.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9bcf72138---fegagekubonigomuvagerelo.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/50088487719.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/10801810057.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/86588363332.pdfIn PDF document text
    • http://someteme.com/archivos/_20210922173619.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/davozikigufuk.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/99010613509.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/waxaxodezi.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/semexusoba.pdfIn PDF document text
    • http://profstil.az/userfiles/file/82204287203.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/tipove.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/8153525566.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/17093365855.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b57f68fce2---20035284790.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/38927084337.pdfIn PDF document text
    • https://italvaping.com/file/xadatejixuwema.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/92739789962.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/13665766480.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/79687756623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=android+10+clockPDF 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_off0000b15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15E 14292 bytes
SHA-256: f9032237ab4a08078cc0e482077ca9b2e16626629089be45ecb1c076fb8c59fa
font_01_sfnt_off0000d532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD532 10048 bytes
SHA-256: b97a46489a0a995baa106f77e7499fe0be755ea7edb0a75325a60cdf535d3d63
font_02_sfnt_off0000eb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1