Malicious PDF — malware analysis report

Static analysis result for SHA-256 15722e51828161a7…

MALICIOUS

PDF

69.6 KB Created: 2021-09-24 00:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f122552e284a8ea73a6948164fcfc8d9 SHA-1: 829ac498882cad820afc1d52a665f968c264db90 SHA-256: 15722e51828161a733a65230558ee5c82ffc47d9fd8c30ab622e29b997f9fb2a
126 Risk Score

Malware Insights

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

The sample was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Numerous embedded URLs were found, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The primary attack pattern involves directing users to external malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://cructi.ru/uplcv?utm_term=game+of+life+android+free+download PDF link annotation
    • http://volkshilfe-ktn.at/images/content/files/90727753144.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/48780290890.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/21419600372.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210912235707_yvsprj.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/xofojakofezun.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/sexerabetutasilugaxujix.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/6327235551.pdfIn PDF document text
    • https://robertbah.si/files/file/kuzumupefejazujetukebo.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/gisaranu.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/93826386974.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b9f19f226---73822991754.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/besajuta.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/50454737760.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/20217586437.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/xagupufupemogemuzajevure.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/55597956626.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/97886325765.pdfIn PDF document text
    • http://erpos.sk/data/files/joromeweworolovo.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/fuditupozujesa.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/bifazezujuribuwisefaromoj.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/3072654712.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/30444092650.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210921050748.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/5345861725.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_off0000b304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1B 10376 bytes
SHA-256: a3da170c5fd6090b309b2930f499401b2809685cbc08fdf4890c3ff26c7f1786
font_02_sfnt_off0000e285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE285 15100 bytes
SHA-256: ef71566926df2dfde27435414a0eaab060be4a2d688b79b6c9edd7174e1a7f46