Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b8c24db7d503f2…

MALICIOUS

PDF

92.9 KB Created: 2021-10-11 03:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 91de87b04ec2d74eaa468ece0b9640e0 SHA-1: e42a78c9a2cdc58de11478adf1d899dc4b4e9e8e SHA-256: d5b8c24db7d503f2bb30ebcb60116e14d524ab0605a8e0cfda870d78340df740
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or redirection attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the PDF is designed to host many links on potentially untrusted sites. No scripts were extracted, but the overall structure and heuristics point to a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f474e146a---fipale.pdf In PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/5f756be84e556b464b2e59064901f90a/tinupuwurobovefaxa.pdfIn PDF document text
    • http://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/bofogelegaxuvexema.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/rezalevadijivu.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/90669823358.pdfIn PDF document text
    • http://1111.morefriendship.com/upload/files/pumogelepogaji.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/46339328348.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/11445746844.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/40126668870.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/dikekajasugebujo.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/90473994357.pdfIn PDF document text
    • https://loyd.rs/images/file/30933741110.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/92875230500.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/papalepavob.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/38931152145.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/ramozemotuvomimugevisini.pdfIn PDF document text
    • http://tulga.ru/editor/files/25464865163.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/55179218429.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/69916545217.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/mewib.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/giwit.pdfIn PDF document text
    • http://3sdent.com/upload/files/togegakunifokorosovupufo.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/40082074016.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/62944411654.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/zoxagijif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=difference+between+polar+covalent+bond+and+nonpolar+covalent+bondPDF 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_off0000febb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D2 10740 bytes
SHA-256: c4f9ce51b008bdbd6be3e02778104ffd1c15a60ddbce47832dd567c00b230657
font_02_sfnt_off00012f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F74 20284 bytes
SHA-256: 620623a04f4fb6b20f110128a1572c1fb0553c1d15c9fc1274e4e454cf4af056