Malicious PDF — malware analysis report

Static analysis result for SHA-256 c499cb5ce5557478…

MALICIOUS

PDF

81.1 KB Created: 2021-09-14 13:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01190d109c94a1832f3b39fbcb4d3e80 SHA-1: 661ccd349ae062ef0bf7d09cbccd8480126082d6 SHA-256: c499cb5ce55574788c7ec0f2b01aa9e0b6af6f56f69fc60e27475a4641eda12d
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support this assessment. The embedded JavaScript likely facilitates the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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.
  • 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 https://barcelonamedicalcenter.com/files/galeria/files/82913484196.pdf In PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/62192986639.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/fivesago.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/pewibedomuvoga.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/fukujizagekuzu.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/38ea54a3f7a47befcf454eeb654263fb/sexanipixupajej.pdfIn PDF document text
    • http://carszana.com/image/upload/File/73583679301.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/siviki.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/69773409579.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/koxubusazudoxigabad.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-13/20210913133233564142.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/begiputelifabogul.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/10165854909.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/96659646437.pdfIn PDF document text
    • http://pk.mo/userfiles/file/naruwaxokobolo.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/92942270800.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/muforotizupemi.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/74573111356.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/56393073609.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161395114ad6c6---29185555626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=rang+de+telugu+full+movie+download+tamilrockersPDF 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_off0000d81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81C 11208 bytes
SHA-256: 99fa3801d6d8adc9b187b2b53f906d274d23898cb9fee20de9f64f042b4d9683
font_01_sfnt_off0000f232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 17140 bytes
SHA-256: 0c95df6d50a18e57232f8ad0b31a25f9d9603166cd8c699e6ec2b86f2475cb57
font_02_sfnt_off00011e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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