Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc3607726badca7b…

MALICIOUS

PDF

78.0 KB Created: 2021-09-22 15:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 005d4d9c09faff79da8fc1460b1366a3 SHA-1: 4ecfa71a260c389e9a1052271e92789e8431a0f8 SHA-256: fc3607726badca7b21305f99d865ea493c3d691a6c659523a490fb824bc8c733
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution document. The embedded JavaScript likely facilitates the redirection to malicious sites, as evidenced by the numerous external URLs found.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=heroes+3+apk+android PDF link annotation
    • http://watthaistuttgart.de/userfiles/file/fazeto.pdfIn PDF document text
    • https://binhvi.com/upload/files/5290586995.pdfIn PDF document text
    • https://mikludava.lt/images/files/3062763775.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/renoke.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-19/20210919120630601042.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5c30d4851---rigidekanafewugiwapu.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/sodisoxa.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/69950089798.pdfIn PDF document text
    • https://turystycznapodkowa.pl/userfiles/file/jowemakabetarijutujenoxaf.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161469dccd1325---pisasalozenaxej.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/97236432845.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/92100324954.pdfIn PDF document text
    • http://www.sunriseacademy.in/ckfinder/userfiles/files/20803473197.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/ziziselosil.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/50401588284.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/wujasag.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/paxutojug.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614404e5b51d4---66681125721.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/23384779353.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/niwewogu.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/xijejasufurotisi.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/vagefetixumip.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/47511624273.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_off0000cb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5C 18116 bytes
SHA-256: a4632cec2734e6f8de00e1091c099ebd5abdf21eff9a79f5aa9c5f9290fe69f6
font_01_sfnt_off0000faca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACA 10496 bytes
SHA-256: 5bc1f1fee1d7d94764aa0f7c9e7d41b58c052e2f3c63d065f79894cc150a656d
font_02_sfnt_off000112c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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