Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d3b52958b587bf…

MALICIOUS

PDF

94.0 KB Created: 2021-09-15 18:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 762a598870d4ec90190f050e608a82cb SHA-1: 6c5927173fd140bc8183d141dfe7966fb000ef95 SHA-256: 55d3b52958b587bfcc672c3b9ddbfde424173712e5f22858b2ba81e8c09011b8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The numerous external URIs, including the one at 'pixomot.ru', suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://pixomot.ru/uplcv?utm_term=ethical+legal+and+professional+issues+in+counseling+pdf PDF link annotation
    • http://xn--80aamwn.xn--p1ai/userfiles/file/wamon.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/39249494296.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/gorozowikarabijofe.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/70818723419.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/gavowowuxawidodubovatad.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/zuzisivo.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/88657593319.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/kewelowuwedetoketus.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/zaxunakilegutokixewusiz.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/70157843075.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/xaraboberutexivopirixaw.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/gilaluwopatesamamugipej.pdfIn PDF document text
    • http://cx-gl.hu/images/files/rivuxakuxubituxoti.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/dabanaloxuzobatideje.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/781b3cd6bd6425992d97555d0ea9f435/volofexenoruna.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/3968703207.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/75893409579.pdfIn PDF document text
    • http://surausa.com/uploads/files/tanokatorokomani.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/tamasibiwiminiw.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/sonikalafubopadogewoweka.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/wolirubomonemevomum.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/86597287788.pdfIn PDF document text
    • http://szabobuszrendeles.hu/files/files/33655523317.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/xujetawanajupezezer.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nowepudok.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/gejegegaz.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_off000109bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BF 10980 bytes
SHA-256: 57d4ae0f0b04f565e8354bd072ca9f97a17841fe846d9ee885ff02b66f681ce0
font_01_sfnt_off000122f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B07 17912 bytes
SHA-256: 15bd69268ebd926a07930fd976d472e6e40ac08a9f098b01790ff4682fba3ec0