Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6546bf6c1070eb…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 10:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 97e2a4270f2aecd865fa78756b42a1b6 SHA-1: 79fd3e04df26991469383a0d95050f33ba7f6eab SHA-256: bb6546bf6c1070eb82dd26a1e5d7a953366d440ea03f33aeb6a566cdbf9d4bb1
150 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, including a link farm on disposable hosting, suggests an attempt to redirect users to malicious sites or download further payloads. The 'download button' heuristic further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://abhimaninteriors.com/ckfinder/userfiles/files/69977922375.pdf In PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/puxefotujufevozozope.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/zojos.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/farirazomizorobugike.pdfIn PDF document text
    • http://ore-processing.ru/d/files/bitiwan.pdfIn PDF document text
    • https://blokhol.com/upload/files/fosewosumebudagos.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/gararinawufelewewuki.pdfIn PDF document text
    • https://jobtiara.com/files/files/58417712798.pdfIn PDF document text
    • https://nls.vn/upload/files/12523340451.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/18295605233.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/77571330157.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144755ec8c72---nepabuxomofop.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/lasiwik.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/65530445418.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/wibukoritewalolex.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/17244801022.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109131019153121.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d635f6272d---65606685546.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/81931176160.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/repuxokefofuvo.pdfIn PDF document text
    • http://lazerom.pro/media/file/gorufolepezelirajofujexa.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/zixewido.pdfIn PDF document text
    • https://successalpha.team/upload/files/26689660170.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/pigiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=apk+mini+footballPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/likesepiw.pdfIn PDF document text
    • 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_off0000e241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE241 17516 bytes
SHA-256: accece51eab4fcb6ed41330509c39cd7cbc19dc4c8b2c5a45e2a6c4ee03b930b
font_01_sfnt_off00010fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BF 10332 bytes
SHA-256: 252b03060e99101539af124dc5c82715edcb0aaa293f5e7af0fa4ee0b33f7537

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