Malicious PDF — malware analysis report

Static analysis result for SHA-256 4894d63133bd040a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 12:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ef7582f9bd69948890b1a42bc41604ab SHA-1: bfc5f1dbd7768d5102210ec9c870512066161c1d SHA-256: 4894d63133bd040a207a39d9a346a4619d70aa96a3dd4494b04341ad976e1a77
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely facilitates the redirection to a link farm, as indicated by the numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly support the malicious nature of this file, pointing towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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 http://files.ibiza-ferien.de/file/nekiruxowotutatenov.pdf In PDF document text
    • http://albarossa.jp/js/upload/files/93839156936.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/rozim.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/161410afa40dba---belemefukabosiwexagis.pdfIn PDF document text
    • https://fishuntpesca.it/file/22909065219.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/78264351164.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/janefuwodinopesoba.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137f9bc1dd7c---29065728156.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/21544536644.pdfIn PDF document text
    • http://ctm.it/userfiles/file/mituziziguvaviga.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/88654965086.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/3592655162.pdfIn PDF document text
    • https://dptech.vn/uploads/files/51627042314.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/ximeruzivunupisipubimafib.pdfIn PDF document text
    • http://santabruna.cl/upload/file/83085692132.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/41056788141.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/xituzijuni.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/segofozoxetulikot.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/98774073332.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/rojusizimolekipet.pdfIn PDF document text
    • http://186086.com/upload/files/rekakalazub.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/32986765450.pdfIn PDF document text
    • https://theurbanthinktank.com/files/rufuma.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/53101247190.pdfIn PDF document text
    • https://longhoang.vn/upload/files/76747533654.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+do+i+link+my+phone+to+my+tabletPDF link annotation
    • 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_off0000d69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69A 18664 bytes
SHA-256: 888df1e58eadd2d9a769fd243f8a5c6b71951847693aead793a191ad6eef34da
font_01_sfnt_off00010723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10723 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3A 10812 bytes
SHA-256: 8185c95b1f85e1f3788a10b9cf4a2b9b47cbaac07ce95505b38d3c60027074f5