Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39a59908dcdba65…

MALICIOUS

PDF

78.4 KB Created: 2021-09-30 10:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: af8e4e9b8bc6223215cf9afaa0c62e09 SHA-1: 87af29ee1c1f4d2678f4826a500934a2315a2bda SHA-256: c39a59908dcdba651b271457437dcfe6943718951f932ac95098fdde2a1f89b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm on disposable hosting, with numerous distinct hosts and URLs. The embedded URLs likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://chcial.ru/uplcv?utm_term=android+head+unit+themes PDF link annotation
    • https://bawaniint.com/ckfinder/userfiles/files/relupofaxodiji.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/91898684723.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/13267655505.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134bfe33e74d---roxajowinogabasanibotad.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/86998661195.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/roluxitudatafuzo.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/71571521683.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/gobolagutem.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/3876905375.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/18014330092.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/27831498117.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/bojapewupogo.pdfIn PDF document text
    • http://guchen.ru/d/files/16194901616.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/gafabifudabesowuxa.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/fdff07.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210925_205534.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/mowopusotenafonop.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/25833476883.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/pexomewiduriv.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/kizimofina.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/45024136224.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/12021892212.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/fipidapixabujovivu.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/54644269206.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/leduvamep.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_off0000c66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66F 10548 bytes
SHA-256: f7a60a64e316263045c87944d88bced7f42a44fce492ddde02b605a03a6ee5ed
font_01_sfnt_off0000de50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF662 19748 bytes
SHA-256: f9eb4198f9f75f1d5ab6c23dc7e549934ef102301057cc4dd9cae8fd7d346ad3

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