Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6c4f4115eb7f66…

MALICIOUS

PDF

76.4 KB Created: 2021-09-13 01:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 37a4e8d5f3c408548ad2e060af2cfb73 SHA-1: 42f0d792b0d9c162b6385327c61531b97def3b18 SHA-256: bd6c4f4115eb7f66cde5e0abecf0899c34de3790133ba6e76fcde2db37cfc065
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of external URIs and the overall structure indicate an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://frickcontrols.com/uploads/files/68554480713.pdf In PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/81442792428.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/98450928234.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/moliradusaragakivodunusik.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613566143d2ae---41295813562.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/rivujoleniraxopakesoxalu.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/wuzuzigovikuvu.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/nasojesarinulitizaken.pdfIn PDF document text
    • http://quranday.org/userfiles/file/xoxafuzatekaxanonifa.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/xeminanozov.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/muzipememof.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/keludeleb.pdfIn PDF document text
    • http://humanlitech.com/files/files/vasonu.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/dawakejelawibujeragu.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210912_095441_6511.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/3337efd47fb5ed41937fef1655b00712/83888577869.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/67026518405.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/91295351149.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/57306195486.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/36288336521.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/rurelaloxavomut.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/2639900011.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/famufugisapef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mxq+4k+custom+romPDF 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_off0000c592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC592 18320 bytes
SHA-256: 421c79e7e0659152402f79b87cc2ec20e15a71437cfd12b0457afb405c892694
font_01_sfnt_off0000f491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF491 10368 bytes
SHA-256: 19505d3ba91ab1868b568914d0c1d7b795e160702b721285aa714eb87b4b6056
font_02_sfnt_off00010c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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