Malicious PDF — malware analysis report

Static analysis result for SHA-256 dccdb320a8499134…

MALICIOUS

PDF

79.9 KB Created: 2021-09-11 07:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6c477eeecf03c3cccf67db280699ac30 SHA-1: c60b1ba1eee3d56b48e0748603933a43e836de05 SHA-256: dccdb320a8499134db3f7449ee39f59f536bfb9a720fae412f2f0d27fcc1752c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various PDF files hosted on potentially disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://thetestmag.com/userfiles/files/kavazi.pdf In PDF document text
    • http://nepalbestcargo.com/userfiles/file/mezivol.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/500575440.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161359b3feb397---88581755518.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/xesilubozapudawalakibu.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/96010641810.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/161301236df08f---kosiriseranixivinonovu.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/kisoderebujipibusakufip.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/97013339511.pdfIn PDF document text
    • https://topupdana.com/contents/files/74778339190.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/ludane.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/51599391892.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/bogexafolavotakef.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109101151501635.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/64052884775.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/rugeguluraberevanitesab.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/60954988514.pdfIn PDF document text
    • https://hoavily.com/uploads/files/xaganolekanusisi.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/46804038628.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/befosuxekujanofakogudoko.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/58134171781.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/xukiluxazujuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+restart+phone+with+broken+power+buttonPDF 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_off0000d4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F7 17348 bytes
SHA-256: 9296d2b7e9850d05196dc1746d52f86f896ad6eee93cfca54d6c7fffab651ec1
font_01_sfnt_off00010184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10184 10712 bytes
SHA-256: 8e0f8b9c14b23ced63ea40cf2119447be98f2e9f69577b22b7adc3de9fdca084
font_02_sfnt_off000119e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1