Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c4cbf6a085f05d…

MALICIOUS

PDF

78.8 KB Created: 2021-09-20 04:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d7be48c0fac501e42834e208fe891ee7 SHA-1: d79c51020766969648336b046f0e5f2cbef22cbf SHA-256: d1c4cbf6a085f05d676405fcb3b73383119455087914ff67bff09b7e9fadd345
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to potentially malicious PDFs on various domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.tvmreza.tv/ckfinder/userfiles/files/42360046827.pdf In PDF document text
    • http://yanartekstil.com/firma/files/vonitewup.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/80757159936.pdfIn PDF document text
    • https://2winit.com/Files/files/vawudimog.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/kasovepotivevixafabaled.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/97021529800.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/18222175600.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/weguxabifewuvovikef.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/70642014762.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/28526079102.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/6977932784.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/23596266845.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109011803121228.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/46601380834.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/56061565779.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/95890342394.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/60952154743.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/womev.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612edf1f8d8ec---82079714101.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/13921461182.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/pemot.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/24082911706.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b17324a7a9---ninedabazova.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/51106684501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=android+10+microphone+not+workingPDF 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_off0000d00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00A 17236 bytes
SHA-256: b4cb5aa7e7e6c4b09f7aed9eb584c2fd049051caa940bd709e7479ff5206b7c4
font_01_sfnt_off0000fcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCE 10916 bytes
SHA-256: e26861e5b6d025a4212ce1253402124670d771531d7cae33f70904cc98bb66c7
font_02_sfnt_off000115bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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