Malicious PDF — malware analysis report

Static analysis result for SHA-256 368fe58dae8c16ee…

MALICIOUS

PDF

86.4 KB Created: 2021-09-15 13:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cc295ee9124175d24316b3e1df8a6dde SHA-1: fbe7fe86c4d83e85765509e1f73cc5871ae0db90 SHA-256: 368fe58dae8c16ee9f8c83b0e444160378ff897f44b53f04c3d8d55921bdfdc8
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, a common social engineering tactic. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it may attempt to download and execute further malicious content, potentially leveraging JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://valenciamaids.com/userfiles/files/39263958129.pdf In PDF document text
    • http://toptoptraining.ru/img/upload/file/vezawejenasum.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/rebaroxosavomiwisibor.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/71812945403.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/48660011748.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/pugagi.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/welimopavosusukatoz.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613280fa1a14a---59824192993.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/rapetotijezokofozitef.pdfIn PDF document text
    • http://isgsrl.it/images/file/sixov.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/31818807082.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/41144999046.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/13489034071.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210911_5BCB9B87052DDDBD.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/tknucvr7tlt5ms7uk35rg2cfvb/vesejubutibujekofa.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/wawezoxivov.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/fifopafa.pdfIn PDF document text
    • http://dmkert.hu/files/file/44157809713.pdfIn PDF document text
    • https://bawauang.com/contents/files/83175259081.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/68532425819.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/87288548015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=transfer+android+data+to+iphonePDF link annotation
    • 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_off0000f015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF015 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10827 17184 bytes
SHA-256: b61bfce7644de4b78e8c2d35cd9cde20fa1f49ab0549137bc757218c9d646ea6
font_02_sfnt_off0001348a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348A 10512 bytes
SHA-256: a486d86f2815517c5310d8c74bee33cd35bd6967f3e86ec0f2a538230f88b151