Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bd02f94dc87ec0…

MALICIOUS

PDF

84.1 KB Created: 2021-09-21 00:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 48d10f28bf9b7c4b5a7928e6fb8cd7e5 SHA-1: 0f1dd5237c52bc0aa887d835bdd1eccbbc0a58a9 SHA-256: f8bd02f94dc87ec0c8d678b07d5f64b1f80017bb8b2ac76287e0568c8fd16490
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to disposable hosting, suggests the document is designed to redirect users to malicious sites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a tactic of using numerous links on disposable domains, likely to obscure the true malicious destination or to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=george+s+clason+the+richest+man+in+babylon+pdf PDF link annotation
    • http://hindel-relax.ch/ckfinder/userfiles/files/72518399945.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/1274206850.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/20872459728.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/femipegixiwujizosolenop.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/gojubukinefataresubigodin.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/83417285980.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jifosimosatixe.pdfIn PDF document text
    • http://njchemland.com/upload/files/surek.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/80285423207.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161475fb054335---vulow.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/65613104284.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/80443691844.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/kajazibulip.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/zedotekabozutil.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/35723115799.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614085725cce0---11077717310.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/18859649929.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/lavepudalatovexivenu.pdfIn PDF document text
    • https://mimpidia.com/contents/files/19001940438.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/tezewegegopobuwibo.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/19460245976133bf1553843.pdfIn PDF document text
    • https://nls.vn/upload/files/42548535305.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/25443474332.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/gafatetulumexunusiwixibew.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_off0000e03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF853 11360 bytes
SHA-256: a23b176d8b326c8902bae4af9875d50715debca69659b577507fdfa957953b48
font_02_sfnt_off00011275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11275 18424 bytes
SHA-256: 4e522f94b8f2b97ce69bc099e5daec36986e1acd0ac5f73bcb9f49a43e478a0a