Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7ed1b476262f33…

MALICIOUS

PDF

93.7 KB Created: 2021-10-08 16:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 53631b528a44e9dfe218b8d2934de7c1 SHA-1: 86aef1375767b1748d01d12b8514384c5ee3a240 SHA-256: 4b7ed1b476262f33a4d33fbb7292ab7b1f2051145f7d030761a82684db9fdd5c
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 a large number of embedded URLs, many of which point to potentially suspicious domains, suggesting a link farm or phishing lure. The wkhtmltopdf authoring application is unusual for a malicious PDF, but the overall structure and heuristic firings strongly indicate a malicious intent to redirect users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://bivalyracing.hu/files/file/wametewurufuviwevu.pdf In PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/9610144854.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/dokob.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/87342533976.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/67763988182.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/pupagikupegoligef.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/turuz.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613965a0d1ed3---veparafakesemeti.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/gezoxo.pdfIn PDF document text
    • http://szcftz.com/upload/sirebatovamalo.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/27236807274.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/genotasodotufab.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/dokafejewezotuzizebo.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/duvusuzudepip.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/gubupufaxapudotuzi.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/22576374141.pdfIn PDF document text
    • http://haihengpharm.com/upload/files/lipakimopukup.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/10245457096.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/10/07/file/23563154307.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///19491945715.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/1vq7t4dlhaenivbs3l7j3mb2q5/bowutaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=diary+of+a+wimpy+kid+the+getaway+free+readPDF 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_off00010448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 19776 bytes
SHA-256: 06bb1467234f3ea6059d3601382d6670f1320b8048e59875078ac24cbad05932
font_01_sfnt_off000137d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D3 10920 bytes
SHA-256: ab49b95ca89c9c59be861268c62b193d93f971699b925820fd8282f75dc9e3a0
font_02_sfnt_off000150ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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