Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0eb46f298f8d233…

MALICIOUS

PDF

78.8 KB Created: 2021-09-16 04:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 72422924ee6b9abfcc6cc59bad241998 SHA-1: 99a30a11cb2e87df865f6ca8e8f2bd818fd4ade9 SHA-256: e0eb46f298f8d2338fdbce46280b2ee88b71153ebc74f7fd7152d5ae5a84250d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure and embedded URLs are consistent with a spearphishing attachment used to deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://crewmak.ru/uplcv?utm_term=the+musician%27s+guide+to+theory+and+analysis+ebook PDF link annotation
    • https://combrooncom.com/contents/files/47452170356.pdfIn PDF document text
    • http://sudeoksa.net/userfiles/file/20210901115753.pdfIn PDF document text
    • https://maisonforville.be/documents/file/dojubuvenugiva.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/73871209395.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/vabusuzagitikizozob.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/nefud.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/jisolovepotupadu.pdfIn PDF document text
    • http://isuzuphonoi.com/data/dulieu/files/lakomosaxoku.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/61398544380.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/xemizovapufedorarir.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/22347750517.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/davemibarifuwot.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/lekesosadaxiwopuki.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/98363374341.pdfIn PDF document text
    • http://nenorm.com/files/files/85937188827.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/18423743659.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/kesezovatunorujajaxiluf.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/guwikep.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/23666865318.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/16845497332.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5863243679.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/52617369547.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/51919167225.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ef5444a89.pdfIn PDF document text
    • https://ntc-container.com/upload/files/11155605392.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/2477865649.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_off0000cafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFB 18384 bytes
SHA-256: e0f9c5691a6e277a5c2ef1215dfb51c5438c64dbf9adb443f34888bd7845e577
font_01_sfnt_off0000fae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 11260 bytes
SHA-256: d31699841c77f9f1bcc633bb871c0dbfcdf34e4ecf50b3dec04986c2f9ba4948
font_02_sfnt_off00011506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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