Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ca905075eb3940…

MALICIOUS

PDF

75.1 KB Created: 2021-09-12 14:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 435599613b80eb1f0d576d118cef9acd SHA-1: 94b88c6b84466eb9734e7726d6a84432c9153828 SHA-256: f0ca905075eb3940aabb783bb81bf4c1102907d78716eab8fe7c3ceda7a2ae74
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to T1059.007, and the overall delivery mechanism is consistent with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://dienlanhhuubinh.com/upload/files/luzudulirewe.pdf In PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/gufuxitofijufasumuk.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/sapuvibudixunid.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/94508103435.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/23460688166.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/29170081729.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/2831309892.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/fonadonaxalusupexira.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/fakejitewafivizosidof.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/9623897308.pdfIn PDF document text
    • http://lenaoyunlar.net/calisma2/files/uploads/lunanetaxonizuxugazaweb.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/27655856954.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/jukivuwepofaturodeximuza.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/20362605289.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2150cbbed---97881274091.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/wosisepofojujusubupo.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/58327618790.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210909081659.pdfIn PDF document text
    • https://led7.ru/file/30617550671.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/zadigaxu.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/goleta.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d06cccdbc---memobakewikupijomazevij.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/kopabuxu.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/37328674947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=stereochemistry+of+carbon+compounds+pdfPDF 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_off0000c3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BE 11268 bytes
SHA-256: 0355b01638bcb57f7e0728897e95da1edbddba416cb4ed36fe79bbb518a32d32
font_01_sfnt_off0000ddc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC7 15756 bytes
SHA-256: 69062635f257bf2e3b6dc6de39758fd4c8fbbaa4445bbefdd013f17db9cb431c
font_02_sfnt_off0001064a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1