Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0dcb9b0821ff78…

MALICIOUS

PDF

84.9 KB Created: 2021-09-19 22:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b2b23c21f223bb804c07b664bcbddd0f SHA-1: 14c054ddea3e1132f424a2e968aaf6e2189abe66 SHA-256: 8a0dcb9b0821ff78a5b49a373677cfb6b59952ea1eaad5e5969661d1a23e28fe
142 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 embedded JavaScript and numerous external links, suggesting it's designed to redirect users to malicious sites or initiate downloads. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://synerhu.ru/uplcv?utm_term=sniper+fury+mod+apk+2020 PDF link annotation
    • http://aotwresort.org/ckfinder/userfiles/files/66369267230.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/ditujog.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9bde1a61b---38309272787.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/kigarodesowabefuzifi.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/70073190448.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/12952701781.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/pubogofijofob.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/gogogolusof.pdfIn PDF document text
    • http://tai-group.com/upload/files/1828000422.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/gutidimepukono.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/muvupupasuzozoxewotebotov.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/23578352110.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/57231307367.pdfIn PDF document text
    • http://hopkim.vn/upload/files/kuretus.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391272bf1f8---80564231251.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/nutonupuxiroru.pdfIn PDF document text
    • http://teplospectr.ru/images/files/2654210820.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/jiroz.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/vuzesobirumafejomeguku.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/tovox.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/57093279436.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_off0000e513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD25 18500 bytes
SHA-256: 3e14726b1449d96c535f9fb8fe58a42af02ca330ac233f37b3d4ee74072ea3e0
font_02_sfnt_off00012d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D30 10972 bytes
SHA-256: 086df151fd78d5d63cb9d14343a02fbea03e40ee1149a3bd961a3b6ed10feac3

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