Malicious PDF — malware analysis report

Static analysis result for SHA-256 992ce9980ffb6bc0…

MALICIOUS

PDF

80.2 KB Created: 2021-09-08 12:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 00eb8a37e45bcb338d8af60e73333a09 SHA-1: 849ea7c1969ccabc85c2868190dea6014d8a99b7 SHA-256: 992ce9980ffb6bc00a8d24ab1a784e10cc23a24415c617521f86897060e22937
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The presence of numerous external links, many pointing to disposable domains, suggests a link farm or SEO manipulation tactic. The embedded URLs and the PDF structure strongly suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://futimisdev.com/userfiles/file/11943974941.pdf In PDF document text
    • https://sealand-pptc.com/userfiles/file/45228676144.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/14112409405.pdfIn PDF document text
    • http://flomojapan.com/upload/files/ketanezejefiwifugi.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/85254358046.pdfIn PDF document text
    • https://ntc-container.com/upload/files/wikalu.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/24966822558.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/43896910392.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/ruketofitadisaxinabamefoz.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/pudulowewinuk.pdfIn PDF document text
    • http://underbutter.cz/download/foto/4561594612.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336d4fcf98b---zubinave.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/zifuligokizom.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/mubefigepeladaxuxul.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/foxurakipizogav.pdfIn PDF document text
    • https://wasael.com/userfiles/file/garofekazisomejazogiwus.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/faxisoravejitisum.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efa7461598---beguniko.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/dogulupuzetudufof.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/5123677316.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/dojosodevetaturebu.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/tetaxet.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/lanakitemozabopomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=making+words+worksheet+3rd+gradePDF 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_off0000d3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC6 17828 bytes
SHA-256: ef5a7df54490a0d8b59d3c0e29e03e240b6814781d9da6446ba7b2d84d95d54f
font_02_sfnt_off00011a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A56 10824 bytes
SHA-256: 805be4957e3927542a207039556b1002cfd2c84eeded7634551fb54b10fb34eb

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