Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a90d8d112764f95…

MALICIOUS

PDF

69.1 KB Created: 2021-09-12 16:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 988bf0ff85512d5302fae6a66beec51e SHA-1: a668f2ce6de9159a42d53d9a49d929297e46e8e8 SHA-256: 9a90d8d112764f9548b9fd93c814cd46ded04af141b568904483e18098fd61aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous external URIs pointing to disposable domains, suggesting it functions as a link farm or a distribution point for further malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://pistant.ru/uplcv?utm_term=d%26d+4e+dungeon+master%27s+guide+2+pdf PDF link annotation
    • https://rasathantrananotech.com/ckfinder/userfiles/files/vukefetuzujarojeno.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/birikasavobuzopujotiperuz.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/lutirebexisaxubobi.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/ganep.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/89260318095.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/bivibomuwarinotixipur.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/tifefobexopudu.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/xapejilekuvufubexedogi.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/fomixikuvelepuge.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/xesomidapafa.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc9a05c657---zevikog.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/jaxoluxupi.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/22364252083.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/92243651511.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/68134870525.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/xopopinuvomupapasubone.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/hrf40h267h78j0p906443elbd9/kilapabuseg.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210906114215.pdfIn PDF document text
    • http://innotack.com/userfiles/file/86428997842.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/taturodagasogomavesapur.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/74332951897.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_off0000af3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3C 17648 bytes
SHA-256: 9889108430721d928434fd50d6cdddc99605d0af2a153245a571ee936d50d290
font_01_sfnt_off0000dcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD8 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_02_sfnt_off0000ef7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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