Malicious PDF — malware analysis report

Static analysis result for SHA-256 82466a924a5b2f2b…

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 10:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f3f0e017e5e5547aee89a143bb51ccac SHA-1: 91ee012dfb7744f6d00f9780898f2dcc4f517233 SHA-256: 82466a924a5b2f2bb8b58e783ff244f6259f47544618f0caa8141bcfb2ff9c44
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many of which are associated with link farms and disposable hosting, strongly suggests a phishing or malware distribution attempt. The ML classifier also indicated a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=the+most+dangerous+game+read+online PDF link annotation
    • https://thuaphatlaihanoi.net/uploads/files/rufanametogife.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/notimubiva.pdfIn PDF document text
    • http://corkpotters.com/images/zelabawirexumolowazeke.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/64972181483.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/60518016345.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/donufufadurokuposeleved.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • https://dptech.vn/uploads/files/78839976599.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/79893786408.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/gavewebelosofumasosu.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/70820162949.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/45686025618.pdfIn PDF document text
    • http://cpviettin.com/upload/files/kufuxoporanotosanofule.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/69291531962.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d3cf319419b500cc98a25c2dbd54247b/29294454340.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/57526710882.pdfIn PDF document text
    • http://all-premium.com/user_file/files/saxudoriwaki.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/teberi.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/9192169947.pdfIn PDF document text
    • http://bdn10.cz/files/file/wojiwawojetufevixizunuf.pdfIn PDF document text
    • http://edeins.com/userfiles/file/80919182459.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/wabepenilogewesuf.pdfIn PDF document text
    • https://loctra.net/userfiles/file/29823848601.pdfIn PDF document text
    • http://deauville.ru/files/file/96330566412.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_off0000e3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D3 17468 bytes
SHA-256: a0b7c172b16f3cfd416cd50c196f156bde631a7dc70be1f9332e5d3942c24849
font_01_sfnt_off00011151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11151 10756 bytes
SHA-256: d052e7a42670cd91042d6e4e679a798e151ef1c9ed3581159979a7596403ae08
font_02_sfnt_off000129a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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