Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0fef4a4dc17f81…

MALICIOUS

PDF

83.3 KB Created: 2021-09-12 18:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c0afc1424e3edc7ff9f1ea4e0a8cd5f1 SHA-1: dc7e60d4a5a7f259436542b092c3c07f75c80af3 SHA-256: db0fef4a4dc17f8194ee55040b1e7290e1f5988d1d70b49a53b267918c99899a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of numerous external URIs, many pointing to PDF files on various domains, indicates a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malicious content or phishing. No scripts were extracted, but the overall structure and heuristic firings point to a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drprdesaihospital.com/uploads/50316800668.pdf In PDF document text
    • http://medical-1669.com/userfiles/files/87424328885.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/336234035.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/linogidosawupux.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/43123466271.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/24077261326.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/15207693097.pdfIn PDF document text
    • https://ferropula.hr/files/96546224188.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/11314256665.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/zurusak.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/gumidomemikelikagufuzew.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/p5cvsgkemslklnhk242eev4oqc/jeneka.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/fulaboposafalasez.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/didigijokikotixajaboni.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///lasuvumup.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/90701824883.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/titomafakirog.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/92435281750.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/tifawunog.pdfIn PDF document text
    • https://sharenkon.com/files/54892902185.pdfIn PDF document text
    • https://ikansambel.com/contents/files/33718623068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=john+wick+3+full+movie+free+downloadPDF 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_off0000ddf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 10984 bytes
SHA-256: 33a0d881edf1c68a3b6bbaccf769d668cc0d7dd12732b29f0b23b846343bbce3
font_02_sfnt_off00010f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F62 18772 bytes
SHA-256: 60c3e0fd65edfea6c61bacb126af1c82f8e522e63b87c3e81d1fe25d3272226c

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