Malicious PDF — malware analysis report

Static analysis result for SHA-256 e447058a7b6c27ac…

MALICIOUS

PDF

89.0 KB Created: 2021-09-20 12:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 972716c043f924da61ddbf5b4dd19127 SHA-1: fe41ed331e99834ead760162c2f1e119427ada06 SHA-256: e447058a7b6c27ac073fc15b4d8ecd3e8665e6fea9c9dd78641382eb7b825a77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which point to link farms on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded URLs are consistent with attempts to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://smidgel.ru/uplcv?utm_term=android+9+change+dns PDF link annotation
    • http://soc-in.com/data/media/files/79342870344.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/o1ludne6vtp67bb8esf7uvi74s/96786094101.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd2ffac1a8---miret.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/vutasujijofaw.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/jusutimofixezoriko.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/gaxoragakiwamuduzejaxik.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/lifutemoreku.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/ronekopedumesezizogepuba.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/vosifarog.pdfIn PDF document text
    • http://dalaichau.com/files/471466391.pdfIn PDF document text
    • https://tierlistei.ch/downloads/97758072731.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/vowipifemagirexaf.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/masovotatisabemoveki.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/268823008.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/kuvugabi.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/zufonipaxixi.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/40381233682.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/35610849632.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/21772583443.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/jexovu.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/55774732891.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/lazuwodukuvugiteguvo.pdfIn PDF document text
    • https://okazionche.com/files/86513198375.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/wotimudizenijovede.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/79140236608.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_off0000f6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF7 10652 bytes
SHA-256: ecd81199541b8aa10bb247f40a4902c7f86f14f5cdafba42c94cc37323eb5127
font_02_sfnt_off00012719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12719 18124 bytes
SHA-256: 7ff96c8772611a95e3b999c0af7265cb3ecaa65563790429ed86c8eeefebc7e0

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