Malicious PDF — malware analysis report

Static analysis result for SHA-256 131a25f2a5815ca7…

MALICIOUS

PDF

85.7 KB Created: 2021-09-16 19:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d696e7fbf01a63e28b78c6dd70e42eaa SHA-1: dc0517b7ab974e6c60dad4eae47c1655be97bf47 SHA-256: 131a25f2a5815ca75fe6dc5f59b66024403223045a4ca722c5be991111098efc
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the PDF and its embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://santehnika34.ru/images/file/765322329.pdf
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/15749163572.pdf
    • http://creative-format.com/upload/editor/files/82371573391.pdf
    • http://kowel.com/ckfinder/userfiles/files/1631465743.pdf
    • https://dallaslandscapedesign.com/media/files/falotigiwarovazedilurotal.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/cqo658dqejnrpq1nhqm9bmo5gd/rurezobijigiguvafudix.pdf
    • http://ossokahve.com/upload/file/wejoreguporesozeluwedu.pdf
    • http://moscow-vernisage.com/files/files/32494798883.pdf
    • http://susasoft.com/upload/userfiles/files/dajomaxukegogi.pdf
    • https://digireg.at/upload/wulakidibedajefarasafit.pdf
    • http://apexibd.com/uploads/fck_uploads/file/vivux.pdf
    • http://pr-jam.com/ckfinder/userfiles/files/52696810805.pdf
    • https://studioconcept-stand.com/fck_userfiles/file/vomozu.pdf
    • https://piauiaqui.com/ckfinder/files/74825994962.pdf
    • http://pc580.cn/upload_fck/file/2021-9-10/20210910195832144497.pdf
    • http://dintainoodle.com/uploads/files/34262301140.pdf
    • http://ukrfirework.com/images/file/94357073880.pdf
    • http://veszpremlizards.hu/_user/file/zifejigawijami.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398fe3cf048---rapabukebedepafis.pdf
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/lavodo.pdf
    • https://corpeverest.com/ckfinder/userfiles/files/giripemi.pdf
    • http://www.julietlandau.com/fckeditor/userfiles/file/xogavorituralujiximu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=swift+keyboard+for+android
    • 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_off0000e7ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EE 16792 bytes
font_01_sfnt_off00010005.bin
8fb7af323c751ba60585eb7d94c2c224054cb7b387f5504067acefd650c546fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10005 10640 bytes
font_02_sfnt_off00011896.bin
6bf0cc3d806d64f494de8941981c2b3cc93ea5b66ce77d8c99180c0652f17b5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11896 18564 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.