Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ce19eed0a386a09…

MALICIOUS

PDF

76.4 KB Created: 2021-09-13 20:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7f9df26e050efaae25a5e80e4368fc14 SHA-1: 7d9589d34f039edbaadc2dd3bf0c057a2a6f1681 SHA-256: 9ce19eed0a386a09c48ba82cba96c1227cd082eb442ff626f121daa7d3d73e19
126 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the structure as a link farm on disposable hosting, reinforcing the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://bilmatbasim.com/userfiles/file/dadoza.pdf In PDF document text
    • https://hsiaoying.com/userfiles/file/zifafadogegixadovi.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/lafupad.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/sebopelejapisom.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/sijadisumixogof.pdfIn PDF document text
    • http://itena.si/uporabnik/file/mugiz.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/51581459116.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/41772067733.pdfIn PDF document text
    • http://bamor.org/userfiles/file/40434977298.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/zesisipudami.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/66441936253.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5b7c5aa27---4423882255.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130253222c06---gumamafazixuzeg.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/gefemapomig.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/99656536188.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/63744603659.pdfIn PDF document text
    • http://crediramasrl.it/public/file/negudula.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/70911189086.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/vutufitiviwakizizufevew.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/widagesagobofinijonozo.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/70972234155.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/lironoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=que+te+detiene+robert+kelsey+pdfPDF 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_off0000c395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAC 10836 bytes
SHA-256: 93012251d4d5b5bb2fb701ac79625588e90ad3352249cfe2403633160171981d
font_02_sfnt_off0000f4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 18388 bytes
SHA-256: cf0d078f4aabdcc7c10c4cc6c5c3ec8b9628ecc860e947c3375687e47f6f589b

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