Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3406c498377b0b…

MALICIOUS

PDF

84.2 KB Created: 2021-09-22 16:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 09a1ff65fcc074e370f199b6d059f300 SHA-1: 407edf01d36ae8179a4ddd59927972e94d26825d SHA-256: af3406c498377b0b7eb55d65d3804389052b48f34cdb0773d284f560634ac797
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable hosting, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are then used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://irlanc.ru/uplcv?utm_term=shortcut+to+new+tab+in+chrome PDF link annotation
    • https://optimustelecoms.com/ckfinder/userfiles/files/lepebuzagunabefukuwokopid.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/82242061489.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/6254459282.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/jutofuwidumefuvik.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/84578983052.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/57212286677.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/8117310763.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/jolekavip.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xukidosoj.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6548885399.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/zazazozakoxu.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/pusapodapetekepajovojez.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/duzusewezikukevodowa.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/6dd3ba44e8e0055b9b5208f752a2465b/28842576514.pdfIn PDF document text
    • https://citronel.com/userfiles/files/witis.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/31901018564.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/36312166430.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131550683ba4---38931251012.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/8978087454.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/kanig.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/mozalovodebate.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/81238080175.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_off0000e3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC2 18352 bytes
SHA-256: 9996141fb5ff7faf41563196e93a8383a3fb3abc39d36ea2ef6f4c50a892b72d
font_02_sfnt_off00012af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF5 10684 bytes
SHA-256: 27aafbddd021901d4689f709002ebe523369552421311ba6da9cd77474e0ad84