Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e430c8ecf95217…

MALICIOUS

PDF

75.7 KB Created: 2021-09-20 12:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a89753e7510070c8a2e22b54601a937d SHA-1: 916abb30012a6572f46087f9614fa8332c9e49e2 SHA-256: d8e430c8ecf952176d092e58a54944e3d23bbb512d37f3f6e2dfe456613f2331
134 Risk Score

Malware Insights

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

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to external URLs, such as the identified 'medvor.ru' domain, which are often used for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://medvor.ru/uplcv?utm_term=jojo+rabbit+123movie PDF link annotation
    • http://architettoangeli.it/userfiles/files/katok.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/63620725632.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/53004438595.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/28306668510.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/72256447267.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16134f86564280---doselisijux.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/67736618414.pdfIn PDF document text
    • http://surinmajestic.com/phya/ckfinder/userfiles/files/fepixowiwiwugigolanol.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091021023544200.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/42874326558.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/rotededuxomomigawivubip.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/riwijiwokesuxewefenome.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/vafumatugakawapive.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/54223033450.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/7836259166.pdfIn PDF document text
    • http://fgosvo.ru/files/files/14173849439.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/29020929484.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/rewoselejaxevumil.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/kudoridebur.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/zawoxagiruduv.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/44662315917.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/21972162875.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_off0000be6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6D 10624 bytes
SHA-256: ffe6fe8d1780ac0536b540f45180cfafbfbcfce5fab2f37ba7654605638a6b3a
font_01_sfnt_off0000d6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DE 19456 bytes
SHA-256: 855d55de4491a82630350005614ca91d9adebd6f7e9f65bac044f4401ed3696e
font_02_sfnt_off000109e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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