Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0eda3be30ef6d9…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 14:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7974773b3cea0fac891805574f4a3c8b SHA-1: 2a2b6b6d775daf5f38a96f5bf09e2e450797839f SHA-256: fb0eda3be30ef6d968c26390ed820a1bf416ad18fccdbdeed2b41f17b925454e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF_JS heuristic indicates the presence of embedded JavaScript, which is a common technique for malicious PDFs to execute actions. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely redirects to external URLs, as evidenced by the numerous external URIs found, such as https://oniceh.ru/uplcv?utm_term=gift+earn+apk, which are often used for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=gift+earn+apk PDF link annotation
    • http://markone-tools.com/upload/files/fixipokipasan.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/60344359417.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/3f625f1baced0faf22143931b04b78af/65817664848.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/60261584709.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/86833243404.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/lisoxisirisebefek.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16130793ae529e---79187860831.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/sabugipelep.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/zijorubufulalarulevegod.pdfIn PDF document text
    • https://sergiomauri.com/images/file/78486486183.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/39092153821.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/novipozip.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/viwetanuzidobojawomobom.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/83245131773.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/50844864257.pdfIn PDF document text
    • https://ckmandarin.com/uploads/71675015741.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/kigukexajovatiku.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/34812440699.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/ziwimozuzulagusulafa.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/63622806934.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/19417013562.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109180549337843.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/dijixatu.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/37469504925.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_off0000e4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BD 10148 bytes
SHA-256: 6f215f7affba0eb49b715de935105a60058018033be16bc0c23e057ff5218fb0
font_01_sfnt_off0000fb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8A 16732 bytes
SHA-256: 97efa22b0a9ca929e63b7df9da8b0d4cf2a719338021c94776e52e820f66d259
font_02_sfnt_off00012726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1