Malicious PDF — malware analysis report

Static analysis result for SHA-256 6744dde8037c807b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 16:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b5ca67f3153cecf5f7b284096f3fa70c SHA-1: f54c73164b297778dc117c2557bdb8e2895c4f96 SHA-256: 6744dde8037c807bce28ce0450ab7325a336bc01505ab55da3b90ae4294135ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially compromised or malicious domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination or purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/losaturaguxe.pdf In PDF document text
    • http://puntolinea.org/userfiles/files/57852265546.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/90494206538.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/57669504478.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/94531316087.pdfIn PDF document text
    • http://hidramaco.com/files/files/zigibimaseropozasarete.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/somuginur.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/zegazovepawiweduwewidisa.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/39040920412.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/90381488033.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/38551628336.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/68150274066.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142b8dee32c9---rezagilademegixubugogifor.pdfIn PDF document text
    • http://identik.hu/editor_up/1506160570.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/6739518326.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/94091574881.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/wikajilafip.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/jetelijusufutometodege.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/wujorigod.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/30329532236.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/54999575958.pdfIn PDF document text
    • http://marymo.ru/uploads/files/6258699372.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/82664018499.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613062a635841---godiwukovamozon.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/63429546312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=best+mx+player+appPDF 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_off0000dcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB2 17172 bytes
SHA-256: f4e58aba8f8df68022ea548233de92631fb39cd4f422e88b467da92a88df66c0
font_01_sfnt_off00010920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10920 10364 bytes
SHA-256: fc3746c82e7e59355c4e090c8ef00a465773ffd4d039c9d57af4243e507b2c23
font_02_sfnt_off000120ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1