Malicious PDF — malware analysis report

Static analysis result for SHA-256 b610ed77518d143e…

MALICIOUS

PDF

80.1 KB Created: 2021-09-23 15:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 64340bd16484282ac552e2dc0cbcb3a9 SHA-1: 63f7388263916c6bfda98af454b429b370839c8d SHA-256: b610ed77518d143e0107f54a11b3c7d7738fa203787b75015593bcad3840d2e8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm designed to host and distribute malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://agcslohian.com/userfiles/file/zutigivubetinigegun.pdf In PDF document text
    • http://iktoktatas.hu/files/file/xanikimisamawivuzosil.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/boxepenamalofeju.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/45548372374.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/31896985474.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16143e4a7b14ae---sizexususal.pdfIn PDF document text
    • http://c-six.it/userfiles/files/tupuvitori.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/5473242037.pdfIn PDF document text
    • http://citty.org/images/uploads/file/88256980735.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/68201019753.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86126108392.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/xepalumuwo.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/golumobafumivosi.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/ninosoxalu.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/31458622646.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/46910805109.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/58809575252.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613e89645b58a---28733961609.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/nukomanizizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=avengers+infinity+war+tamil+dubbed+full+movie+download+tamilrockersPDF link annotation
    • 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_off0000d1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AE 11396 bytes
SHA-256: a732bd467727bacd9bd27c93c0bac5050dae4d99487031c0d7b8dc388a663e16
font_01_sfnt_off0000ec79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001048b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048B 17524 bytes
SHA-256: af7b6c270206e427be9487e544c88190527d4f05cc00e35d2d97a714b097c0d8

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