Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1455e1b210caf2b…

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 15:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5b5b0d7674f02120ac05f3170b4aec05 SHA-1: 22bc8cb44ff267930eae50282cdc633011c8fdcb SHA-256: f1455e1b210caf2b2d4ab494c3d03a3ff4c21eb0e952005a7ed3e2a481cce24b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and configured as a link farm, strongly suggests a phishing or malware distribution campaign. The file's structure and the nature of the URLs indicate it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://sitoad.com/bbqjoekey/files/202109122317517419.pdf In PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/59213086308.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/18126557998.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/xanafemipoputixirel.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/kidexuketimujefegodi.pdfIn PDF document text
    • http://sciattella.net/images/file/65780799391.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///xuriwizejafu.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ikt2494sbfc312d167mbvnmut1/sutomomawo.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/4653214c7a87bf07dfdde8ed8c6e4029/7701948313.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/10757924658.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/mabafuxubafoleki.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/45344449915.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/jonafo.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/zolilagikofufelomepa.pdfIn PDF document text
    • https://escritacontabilidade.net/fotos/news/file/toxemonididoregesize.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/262344193409.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/53053331326.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/68550389837.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/rafekufusajew.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27149128554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=wrong+turn+6+download+filmywapPDF 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_off0000af18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF18 15688 bytes
SHA-256: 59b82f5eaa42e8373ec4ffa10b1b9013f83356323d3762ff992f567e6ec6f742
font_01_sfnt_off0000d679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD679 11000 bytes
SHA-256: 1831ac910d8d484ecf2c5a99fb6f5e1c2328708b5a98a6139baba330f7973dee
font_02_sfnt_off0000efe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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