Malicious PDF — malware analysis report

Static analysis result for SHA-256 538becea5c9a7201…

MALICIOUS

PDF

78.9 KB Created: 2021-10-05 15:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ce8a3540f46bd36a42ea288793a25fc9 SHA-1: ee10d34175033403af6536ef95b4bc0542d0238e SHA-256: 538becea5c9a7201556a36b9f76d380c7d22230df9cedfa99d320c69f647a642
134 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many of which point to potentially disposable domains, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://geologicatoscana.eu/userfiles/files/8087612288.pdf In PDF document text
    • http://ecohort.com/userfiles/files/78384142541.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/xatebodumuzaligetumek.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/vogomotenag.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/70920082105.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/tidip.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364e217385c---37938738979.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/sosovatikogivujupowunagu.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/wodiroj.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/68337872600.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/tumovokutojerixibi.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/20662483150.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20211005/files/20211005102421.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/161404b97183b1---wopovebefidaludom.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/zifutomitaduzug.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/80374948995.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/70210600941.pdfIn PDF document text
    • https://maturana.cl/upload/file/13661591399.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/25389326190.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/ledusovuxojipakinuribo.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/17759062748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+times+of+india+epaper+today+pdf+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_off0000ce06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE06 17976 bytes
SHA-256: 078cf99255463d9324dce101a12092652fd3db3a6c6496cade651b0259463ba4
font_01_sfnt_off0000fc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001146f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146F 10924 bytes
SHA-256: a194b38d13766ae472aab1ee2a32e6d3118021bfc46159c4de1a81c2013a98ac

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