Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e7a9a7ba963d66…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 12:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 25e4c961ef3999167a6c1c64a3614a07 SHA-1: 70b5436f287413dbf1b7bc2e76526ea5f8bc52d7 SHA-256: 16e7a9a7ba963d669b7815465e0648e7de1951f8850cdde94fb5cf7a998baa92
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=beewi+helicopter+app PDF link annotation
    • http://magicfood-cn.com/files/20210921102849.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161447d575f4ef---82530134363.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/sufodivavelulewajeb.pdfIn PDF document text
    • http://belloverde.net/emailer/file/rabejimesigukux.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/15369446255.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/kikovufemonow.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/sitasalor.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/66089955290.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/58397660256.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/020248151046.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/50889486183.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210907142511.pdfIn PDF document text
    • http://roocenter.ru/upload/file/49095165460.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/fupof.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/budurana.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/34128636414.pdfIn PDF document text
    • http://101balkon.ru/upload/files/mekarib.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/dobelof.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/robegaxiriweza.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/3025007803.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/78058065268.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/79137528103.pdfIn PDF document text
    • http://novafish.it/userfiles/files/52334865052.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/zafom.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_off0000b199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB199 15544 bytes
SHA-256: b2fd2b6dbf44886bbe876418feebcee80aef13bc17524f20f418855f259e886f
font_01_sfnt_off0000d960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD960 10340 bytes
SHA-256: 1d29fbe1e4a0e9d5916414cc0b95ea3dac270e61c14d96d78f67eb7095a50304
font_02_sfnt_off0000f0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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