Malicious PDF — malware analysis report

Static analysis result for SHA-256 09911e833a63e46b…

MALICIOUS

PDF

70.6 KB Created: 2021-10-01 05:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6622f0cca67706ece252dfbf8d6d424e SHA-1: d3e4ceff5211d99258366730bdc3ccbf2ab9ca38 SHA-256: 09911e833a63e46b118b1cf57625f9e883ec9558a46830f4b3c90a93317ab62b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://huntic.ru/uplcv?utm_term=hack+sunwin+apk PDF link annotation
    • http://isvpro.com/custom/files/nokajivikasawoto.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/lexuvup.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/15096868576.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109140947173572.pdfIn PDF document text
    • https://costarica4d.com/contents/files/zaritokukabuxelesojef.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/14941527970.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/8091827802.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/ridunutiraf.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210929143400.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/2917876811.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/lused.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/59608417348.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/toliporow.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/wigaluwowaneg.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/23055043624.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/76511484009.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/wetawetinide.pdfIn PDF document text
    • http://clingac.es/d/files/24667629227.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/fipokosovijegiwebaroseme.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/zizaz.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/jufobajabejarasolebuwaful.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ddfd2451ff---safurenekitokazefivapef.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/92243999797.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/31958324706.pdfIn PDF document text
    • 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_off0000b1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0C 10140 bytes
SHA-256: 6330de207f8bf82e65449d03763ba65fd50827033aa213d02d39bc716557b1aa
font_02_sfnt_off0000e0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D3 16548 bytes
SHA-256: acb89c51b0aef31207bc91fea4cbab8dd97d594e7bccb636dadb1931ddc870dc

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