Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b2f635e93fb8ad…

MALICIOUS

PDF

90.6 KB Created: 2021-09-11 05:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6b17e53f2d88ef738cce13e85d9c32b7 SHA-1: 593e822f2b2f60f82cbeafea1fedc81218bdbf37 SHA-256: d7b2f635e93fb8ad28a97606f1706aa3dfd81aeb28ff0433a0ba8665af32d67b
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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=boot+animation+maker+online PDF link annotation
    • https://www.meditech.cz/ckfinder/userfiles/files/xarutobajogum.pdfIn PDF document text
    • http://surtek.biz/image/files/20150320_124340.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/94315118789.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/punelakubo.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/1105875478.pdfIn PDF document text
    • http://adveotec.com/img/file/59599966807.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210903_130001.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/34608495337.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/zitiparef.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/19438663368.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210908/1443266979.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/98887030502.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210904_F25E41DD15538CA4.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/42802316192.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/12825609384.pdfIn PDF document text
    • https://onecre.com/images/content/files/67845796918.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/wixan.pdfIn PDF document text
    • https://sharenkon.com/files/joluzubesimuneboxomive.pdfIn PDF document text
    • https://2winit.com/Files/files/38167515739.pdfIn PDF document text
    • http://analhospital.net/file/files/3253361818.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/22322046161.pdfIn PDF document text
    • https://jensbrode.de/files/file/fogubomatizezixi.pdfIn PDF document text
    • http://cutskytools.com/d/files/timapuxovapabile.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/kapegigemowowitorola.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_off0000fe03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001161a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161A 10244 bytes
SHA-256: d010cf98784c53075f7c13480eb97675c0af938ed6d8e33bf31a24f88a403644
font_02_sfnt_off00012d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D12 18324 bytes
SHA-256: 745e4da99447034bb521ea196273184c72ce2585ba35cf3bd0edf194f78d891d