Malicious PDF — malware analysis report

Static analysis result for SHA-256 b03bfe06cadb3076…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 10:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0a62066a356d0a8e097a137d37581742 SHA-1: 15c672810712e488155b9b0269ddff5495ca4f4d SHA-256: b03bfe06cadb3076917634651bd702ddb29e4981978600b1209fb47d65ad65c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as malicious, including a link farm on disposable hosting and a high ML classifier score. The presence of numerous embedded URLs, many pointing to PDF files, suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.euro-fly.eu/userfiles/files/towud.pdf In PDF document text
    • http://studiomilano.eu/userfiles/files/74739480813.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/senuneboxosizorefina.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/76917006080.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146f0dacf36c---47837555581.pdfIn PDF document text
    • http://pololanna.com/user_img/files/12722504363.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/8510671701.pdfIn PDF document text
    • http://underbutter.cz/download/foto/94610017548.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/vonuviduna.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/regolilodupijokuf.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/16388368112.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/25906300116.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/xokatuve.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/e9bf405873439a93fc05420d34fa4ba1/faloromazur.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/finimatabizavob.pdfIn PDF document text
    • http://houselandia.ru/files/22424192361.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/dimamafaraledidu.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/midavasumovoxibiz.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/mifuvetebojatila.pdfIn PDF document text
    • http://chinazzjx.com/d/files/4821641887.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/kopajutagejuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=mbx+m201+firmware+updatePDF 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_off0000aca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACA3 15680 bytes
SHA-256: dbe85c5e361c1e3469b8d617b7cfc7a93c145e9892a55a06ded6de705a343035
font_01_sfnt_off0000d461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD461 10936 bytes
SHA-256: 81d3fe4a2f11e98d632f8edd9538d428b7e7332a01d5a53d173efbbcd9e4c281
font_02_sfnt_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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