Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b1546af11ff986…

MALICIOUS

PDF

72.2 KB Created: 2021-09-26 23:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8156d4c071dad250bad89eb3d4d185db SHA-1: 4d512d87d025e8b045e742af04105ac6411d8367 SHA-256: e1b1546af11ff986ff833f939bf647301a07d589a1f87ddc2ab67123ddcece08
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded JavaScript stream and the presence of numerous external URIs suggest that the document is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a large number of links on disposable hosting, a common tactic for phishing or malware distribution.

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 https://inwebjor.ru/uplcv?utm_term=cleo+vc+no+root+apk PDF link annotation
    • https://monamifrance.com/FileData/ckfinder/files/20210919_9946067E2097429E.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/bajefevugolazomejuzinib.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/tokulimozokufaledoxad.pdfIn PDF document text
    • https://endobible.com/userfiles/file/50643518759.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/41533185852.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/27023413223.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109151655023961.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/41529771409.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/0fbdqlro6umu1nis60mdk9qema/sadigejugileguvanu.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/98745617003.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/73275605490.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/843hpdiqv8jm5l5gcvi98oq7kn/22010124443.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/38703699248.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/xituleguduraroganovizuni.pdfIn PDF document text
    • https://demo-universal.order-pro.com/ckfinder/userfiles/files/kopowidomixidu.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/firawuzejovet.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/femitanozozaveme.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/lofosujazod.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/81823689251.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/goronem.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/59416657351.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/62507022755.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/1822851687.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/patememarid.pdfIn PDF document text
    • https://mihalex.by/files/files/xofarefozofewu.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_off0000b55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55A 18188 bytes
SHA-256: 2fdf238ba5c2d8e203308c0715948631eb722cbc7fe37b11de46c06f83b686ee
font_01_sfnt_off0000e3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AC 10296 bytes
SHA-256: ee063510be2365a91c898514604cef5e891c566518f7232f269d1c1cd1a6af5f
font_02_sfnt_off0000fb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1