Malicious PDF — malware analysis report

Static analysis result for SHA-256 d348f1243c756c90…

MALICIOUS

PDF

70.7 KB Created: 2021-09-27 07:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7fa89bf524e21065475968cd248b638a SHA-1: 1237d280f0392e053d348ac5c4f0b32d210b7e08 SHA-256: d348f1243c756c90b61656aa418d3125fef1fa4137f19905d8e40fc71376b7dd
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 part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://wastran.ru/uplcv?utm_term=2020+best+game+android PDF link annotation
    • http://ruihuitax.com/files/file/90069946403.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-26/20210926125654252608.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/44485143223.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/wekinedip.pdfIn PDF document text
    • https://kuepancong.com/contents/files/98480064625.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/gexomamogewizekugut.pdfIn PDF document text
    • https://terracell.pt/images/file/6313469095.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/jegenuxenasowofafowo.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/fabako.pdfIn PDF document text
    • http://ranczowdolinie.com/files/36051818020.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/62355348787.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614156f100a43---juzezobaxodezitamo.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/28464132995.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/vanunofofi.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109170508023282.pdfIn PDF document text
    • https://pansky.ru/UserFiles/File/ketoniju.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/90463833726.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091611020988.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/nuzinagapijipufuvela.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/52584918595.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1632587423.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f921f3a06b---60405476288.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_off0000b187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB187 16840 bytes
SHA-256: 52c056a608625488cea2343a997025f0247d64a7fe4ac87a6e276011940fa032
font_01_sfnt_off0000dc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC87 10832 bytes
SHA-256: 2b01a5f6776612204ee049d0330090ed9def3c5b11fbca596526f83e1291e737
font_02_sfnt_off0000f557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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