Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd963b9040e4dfb…

MALICIOUS

PDF

73.7 KB Created: 2021-09-09 07:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb4be0dd3cbab9bc20a0310bad86c114 SHA-1: 70b2fd62192567f163af1697b965332559e394e1 SHA-256: 3bd963b9040e4dfb86351b9b1f97aef874abf1aaf328724dff485306175903af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs pointing to various domains suggest the document is part of a link farm designed to manipulate search engine rankings or redirect users to malicious sites. The document body is heavily obfuscated and contains no readable text, preventing further analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://gugugroup.com/userfiles/135917264.pdf In PDF document text
    • http://kassa.pl/userfiles/file/95619736576.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/wekuvawikivusivipowoko.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/80586020270.pdfIn PDF document text
    • https://datenglagi.com/contents/files/luporaxapufagexedawalor.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/17070253631.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/82537953878.pdfIn PDF document text
    • https://epiphanych.com/images/file/88654343261.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/13228990801.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/xasogusatoxe.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-9/20210909023518466531.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/loturizijaretanudo.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/91890448708.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/18803433237.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/jivupimujeva.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16136f1c859c1a---wuvidovepibojolesepilod.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/xotiremifedepige.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/guwopuvujokufew.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/rakenaxovakov.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/5395926701.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/tigenapugu.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/6004396451.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/21563181800.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/79226116292.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/fomavovijavutudofalabu.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/48971937180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=seo+rank+checker+toolPDF 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_off0000c085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC085 16120 bytes
SHA-256: a27b79e11e575f0d718bd2b5b24aa6aaa79bc59d3cffd5dd4a28a5256c12713b
font_01_sfnt_off0000e9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DC 10232 bytes
SHA-256: 3fbbfe14efcac4d8d2b4207d37e51375988273b4dcc6939093048c75a22c7e20