Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9fe4f97e5cf8cc6…

MALICIOUS

PDF

79.8 KB Created: 2021-09-22 12:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 02ae2a37864f25d01e3b54be38096ab0 SHA-1: 870aca46f2a2d674775a443c292cda477a48aae6 SHA-256: d9fe4f97e5cf8cc62855a2cad27550699037eef2123ba1d943944960a19dc130
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 heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm hosted on disposable domains, aiming to obscure malicious destinations. While no scripts were explicitly extracted, the presence of numerous external URIs suggests an attempt to redirect the user to potentially harmful content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://brigitte-farner.ch/userfiles/files/6257254001.pdf In PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/bezasanupabisuja.pdfIn PDF document text
    • http://technocom.pl/editor/file/62702921646.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/panoxovugazomewuxa.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/23818045092.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/42844423886.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109050745355663.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/xadow.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137f1460c1da---66363836865.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090518194473499.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/sulafuvukevobenege.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/86839152642.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/dolevekexilekowegamaxa.pdfIn PDF document text
    • https://norservis.info/files/files/61408485017.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/62121109791.pdfIn PDF document text
    • http://kaies.net/upfiles/file/425364061.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109200046456770.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/vabikewovakujaju.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/75376219946.pdfIn PDF document text
    • http://freeski.hu/freeski/file/40871748248.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/demipa.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210915231403.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/16445407242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=como+borrar+portapapeles+en+androidPDF 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_off0000d01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE831 10724 bytes
SHA-256: 87fb6566d330fea4c0d09ac3d0de7b265204861ddedd8574eeb8570b50ff863f
font_02_sfnt_off0001008d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008D 19204 bytes
SHA-256: 4b847c2187ebcce58eaea2b345d2242451a9407fbb263cd4b1ac6671e7c47c51

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