Malicious PDF — malware analysis report

Static analysis result for SHA-256 6326de3a906cea31…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 19:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bcf6b30c0a6e7e1303ae9711d08640f8 SHA-1: 0baf170dc9ef1045d9160ac50bfa7bd46df80719 SHA-256: 6326de3a906cea31f3fdc437da527331deaba71888e0c81403b9e28be0d900a5
166 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on disposable domains, a common tactic for phishing and malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download an archive, which is then protected by a password provided within the document itself. This is often done to evade gateway security scanning. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://meteoratourismactivities.com/files/files/towogud.pdf In PDF document text
    • https://cmottaviproductive.it/uploads/file/1797734798.pdfIn PDF document text
    • http://prompol.com/media/file/kudosotugobuxutagotejumak.pdfIn PDF document text
    • http://baove24h.info/upload/files/20081825979.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/75171963282.pdfIn PDF document text
    • http://lawina-radom.pl/files/file/62789155744.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/98451244883.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/15656250770.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/dokaziju.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/bcf1iaoen8q86un8h756dd3tnn/96095326689.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/67737736173.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109162154139998.pdfIn PDF document text
    • http://grabnerestriche.at/luripidanixeburidole.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/12251426470.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/9452715973.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/nulug.pdfIn PDF document text
    • https://scmsgroup.org/ckfinder/userfiles/files/34892970156.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1284993271.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/jevexufupibazidegutexolab.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/gibumexo.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/bibugamaxowidazopewobemo.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/zulewuj.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/92482580412.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/masisabanewemegewedijizug.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/85370671290.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/20589663291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=download+apk+zip+archiverPDF 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_off0000d376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD376 10652 bytes
SHA-256: bcd49735860e04aa42a46dc7d80364305fc1a5b7cab76edf4a5e156376f56f53
font_01_sfnt_off0000ebcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCC 18272 bytes
SHA-256: 57405cbefaf531b2e567cdc9cd7b91ac71db25a40747487029c6f6365d4a4837
font_02_sfnt_off00011bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1