Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc55a88f897a5b15…

MALICIOUS

PDF

71.8 KB Created: 2021-09-19 17:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 28c18181e56e19b8f820ea79a0dd5558 SHA-1: e32c3f3aaaf54e4bbe5570e620bcd9073c29c211 SHA-256: fc55a88f897a5b1559eef273362e71041d07b704ad4c16e4b1d49f11cb1224ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, indicating the PDF is designed to distribute links. No scripts were extracted, but the presence of external links is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/r1md6d2die43h4im7qfq6llum3/53744250095.pdf In PDF document text
    • http://sun-eko.eu/files/file/16851779160.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/movimaxizu.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/fadudotobuwuludevuliro.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/15615962755.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/90491349284.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/ramufezuropa.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/wutunigoxulugoladeke.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/dokoditenaroxuru.pdfIn PDF document text
    • http://ledins.lv/cms/file/4461255586.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/zevagoretofopobiralo.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210919080426.pdfIn PDF document text
    • http://mamam.by/upload/File/file/77724319214.pdfIn PDF document text
    • http://tulga.ru/editor/files/63451500822.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137a130c2ea6---79408604614.pdfIn PDF document text
    • http://cloverdiamond.com/file/pejik.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/7609681812.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/95791203085.pdfIn PDF document text
    • http://nenorm.com/files/files/tuzokuma.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/68457862344.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/zonanewozew.pdfIn PDF document text
    • http://kotrackusa.com/fckedit_file/file///20210917_19_30_49.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=is+lastly+a+wordPDF 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_off0000ba3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24F 16100 bytes
SHA-256: 183dc697c348dee4d5f48da57944e0e38d996ee45c01a4c4bec8c69ab25ecebb
font_02_sfnt_off0000fb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB49 10064 bytes
SHA-256: a10cb996ca260765dffb3751d0cb2b54441c7e17ca2128207626673ffd54fb03

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