Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c9b9763b7c3c7b…

MALICIOUS

PDF

83.8 KB Created: 2021-09-22 11:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9878b74db0b7ff46916756fd32ae4613 SHA-1: 61b0a1756a29ad1128ded48d06fc6e54a962fae0 SHA-256: 12c9b9763b7c3c7bf03d3df6522b7861335a8959f23345c391c6b418ff26f5fd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with high confidence. It contains embedded JavaScript and a large number of external URLs, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is part of a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=top+10+video+editing+apps+for+android PDF link annotation
    • https://www.solucionaesp.com/ckfinder/userfiles/files/31796640129.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/losisodutek.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161482e3fe8c6f---13518022633.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/60213101674.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/18265798493.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/gefigux.pdfIn PDF document text
    • http://advertisingreports.info/assets/ckfinder/core/connector/php/uploads/files/88046940845.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/xofazelasixu.pdfIn PDF document text
    • https://cityface.cz/res/file/videxutarefemisefipuvo.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/notesemoxozavuxu.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/36807684278.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/jomisefelagipu.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/surof.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/vonalujuzoraboro.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/89534292335.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141646b9def8---bekizifubirepexosiv.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/69768447651.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/30228344660.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/kekamolupima.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/sijeziwekanososusekamu.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///17570384206.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/kejijerawosa.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/2372337332.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/winimowomo.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_off0000e4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AE 16732 bytes
SHA-256: b2d5a33169aae65bbf44136df1b037498e3818e3df6c41fc01b39d855d17c2b9
font_01_sfnt_off00011017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11017 10832 bytes
SHA-256: b72aade22df4dbe31e4390d655eb0ce32086de5d3738534a499d7dbde0b00d27
font_02_sfnt_off00012910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12910 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1