Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee0b9eabcca33bbe…

MALICIOUS

PDF

69.6 KB Created: 2021-09-23 15:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f9b4c1d397ae4912e026de55579837ed SHA-1: 3e33cfc3e8281734fd0a1841df5e21001dbe613f SHA-256: ee0b9eabcca33bbe5406be33fcfc2abcefd642773c9badf1a1b26d449a4317a5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, often as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://castudio.eu/userfiles/files/makafirukixavapu.pdf In PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/fuwavujofeli.pdfIn PDF document text
    • https://go2germany.ru/files/file/87677540977.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20219152148586481.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/fawadisaxekisoxedapuwa.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/jelexulane.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/siluzor.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210921192325.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/55660122024.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/mexugewaregovawupe.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/64971549683.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e224858fe0---10401017807.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/89160172064.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/wubija.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/fisokudowuja.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/tobenoxedufexujatiso.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387656ba2e9---xixajo.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/debomeloxitaxawifus.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/zanukurimanu.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/vesube.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/11549887981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=clash+of+clans+hack+version+download+town+hall+13PDF 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_off0000af40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF40 11072 bytes
SHA-256: 4452bbe9b86d216d180164e8d2e1911ab30dd5b44e3b67373f94b05f91c13464
font_01_sfnt_off0000c924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC924 15652 bytes
SHA-256: 8e4cd7203832fccf81509706ddd5213a7a0f21bb4ac2af17a5d6f183151ab075
font_02_sfnt_off0000f0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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