Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c93581deb0059d9…

MALICIOUS

PDF

70.6 KB Created: 2021-09-17 07:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 718d3a787f8abe56d2b915f4f4582ff4 SHA-1: a8cd2a930124668fdce7d7f0b7679b1c55afe6ea SHA-256: 5c93581deb0059d9de156a6be24a16f3d1c75f0da7d8d97108ee7fcc5f3b70cb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV. It contains embedded JavaScript, which is a common technique for executing malicious actions within PDFs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates that the sample is part of a link farm on disposable hosting, pointing to a phishing or distribution campaign. The embedded JavaScript likely redirects the user to one of the numerous URLs found in the document, which in turn host more PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://ljjxmining.com/uploadfile/file///2021090801535752.pdf In PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/4290585772.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/97395528820.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/97284348736.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/64206186038.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161420096983ad---fowoki.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/92270364740.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130054f17791---gewagixawod.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/34811752249.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/31710202736.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/64657127948.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/82968378999.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/jivelirebusikime.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/pejinomibij.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/90199885237.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/sidelabizinevabudiv.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/nowititexifixawexipese.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/dusap.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/viwabarikavosagiwidit.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/17335690995.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/62163233174.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/mokagoxepobaxowozigoza.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/181046098333917771868eb517486f9e/zaxux.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/rifepogorode.pdfIn PDF document text
    • https://irantruck.ir/data/file/67554347426.pdfIn PDF document text
    • http://terrietanaka.com/library/files/dasinaravisad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=base+apk+cameraPDF 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_off0000b61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB61A 15936 bytes
SHA-256: 3010bc767a5aa35d005cce5319ad21ecc1978bed2550da58ddf3bcba048c350d
font_01_sfnt_off0000de4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4A 10220 bytes
SHA-256: b08451ed274e5b6beb9940953e048c9a5bef817583818b398ca6b486e30bf780
font_02_sfnt_off0000f54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1