Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ad95802b1389e8…

MALICIOUS

PDF

78.8 KB Created: 2021-09-23 20:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e280fae05ef44e36a81c0f8f2e11faa0 SHA-1: ead981a52b5ca6851941bcd382c79a6a396f4c39 SHA-256: a8ad95802b1389e84e2044ce9772421fbafba4796154c5832d78a193ba89dd4e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains or are part of link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=kontak+telepon+hilang+android
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/89404835024.pdf
    • http://gkz-crimea.ru/userfiles/file/zaraxeradafinukixeboxir.pdf
    • https://estoniapools.com/contents/files/pimipa.pdf
    • http://emailreceptionist.net/userfiles/file/fegabaken.pdf
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/26555859550.pdf
    • http://manu-transport.com/documents/file/25817845453.pdf
    • http://webbyshoe.com/fckeditor/userfiles/file/57610365624.pdf
    • http://usaoxin.com/userfiles/2021-9/file/75963604463.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/73vrvhu9fmo5jp6br617584fdj/movufudijetijoruledo.pdf
    • http://tincorner.vn/uploads/files/88018167217.pdf
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/sulovubadonomelusotefov.pdf
    • http://electric-kernbichler.at/luzorija.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe4c36368f---zutafekonipagalafi.pdf
    • http://strahovka66.ru/userfiles/file/29095738943.pdf
    • http://cmtsport.com/pliki/najizegoman.pdf
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/wubosuxaterigidovomojefax.pdf
    • http://st-ark.it/userfiles/files/43645179050.pdf
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/bonagojeteguwoxiwajijen.pdf
    • http://kimkhimientrung.com/uploads/image/files/93625827604.pdf
    • http://keletunderground.hu/images/uploaded_pics/file/wibalororogogasebejojuma.pdf
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/wunoguvegepugobune.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1e0.bin
00f9a5ea7fa9268b40efeb10958cb5666a3783223cda85978ec9d7764154c291		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E0 10588 bytes
font_01_sfnt_off0000e9b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B8 16792 bytes
font_02_sfnt_off000101ca.bin
6286abb2109f5b31653fb68718094bc9c8c72148687894fdb5795ba16af196e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101CA 17032 bytes

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