Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ed3670539ed0239…

MALICIOUS

PDF

92.2 KB Created: 2021-09-10 19:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 9f812d6f4421ea1ed9e69d0e74b622d4 SHA-1: 2c470487a0714cd49b8ca89430ea857f082e38fb SHA-256: 0ed3670539ed0239126fd30b64bd77a0ddb332b796a043cc8da8f5fb091cc34f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. It also contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://archism.ru/uplcv?utm_term=how+to+restart+mi+phone+without+using+power+button PDF link annotation
    • http://redondoclassicburger.com/uploads/files/tejawujokozujeladusuxukux.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13497421976.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/6961178287.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/dunifimosa.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/nijumi.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/wutudepadenap.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/tuboratuz.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/51258571798.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/92916640588.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/nuvosilawenefutazapen.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/xoxinosudef.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/55761280950.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/2065572689.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/futaj.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/gomagi.pdfIn PDF document text
    • http://ty-int.com/files/files/nosus.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/kerivafux.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/70354339204.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/gukavaviwimo.pdfIn PDF document text
    • http://oris-am.com/editor_up/wufoboxupitaxik.pdfIn PDF document text
    • https://nakshistudio.com/ckfinder/userfiles/files/93472844928.pdfIn PDF document text
    • https://onecre.com/images/content/files/16619874038.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/57663505709.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/gesadumojiwudefi.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/sefusaguka.pdfIn PDF document text
    • http://tercovci.cz/files/file/nemedowegum.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_off0000fe0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0E 19560 bytes
SHA-256: 229e4c465728d793b97838793337e9b6f1159f8c73818bfc31f94ddc89b325b8
font_01_sfnt_off000131bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BD 10972 bytes
SHA-256: 326ca189cffedfc958c4a7f57f1b97453bed63d12066b2613d25574ea7cf255a
font_02_sfnt_off00014ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ADE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1