Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3895e5a95ec6a4b…

MALICIOUS

PDF

70.6 KB Created: 2021-09-13 01:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 815ebbb62aec2f3624dca4d0b255a066 SHA-1: ef6010eda1adbed8107c6b45da1111e144e79642 SHA-256: d3895e5a95ec6a4b3848c74d22535334fe18ebc7be57a96ae5e69c2af5ff22a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many pointing to potentially compromised websites, suggesting it functions as a link farm to redirect users to malicious content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://gurukripapublicschool.org/userfiles/file/feravololimewel.pdf In PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/20908772777.pdfIn PDF document text
    • http://myslizdrave.com/soubory/guresidaza.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210909_B5A36E29968CAF78.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/73100094517.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136de6c10edd---25851114305.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131712b3432d---26711277420.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/waxetoxixawejo.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/toladogid.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210909211039.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/62786408015.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/vonarutabikegariv.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/9017388487.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109051736204484.pdfIn PDF document text
    • http://ty-int.com/files/files/nodojaluto.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/2272047312.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/43031089003.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-3/20210903025144395320.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/pozulixagaxegexoxotagaz.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/riletate.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/mosetinulonutilarepokuti.pdfIn PDF document text
    • http://yuli-china.ru/d/files/nekusavivufepu.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/4608487323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=rubber+materials+listPDF 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_off0000b4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC3 16240 bytes
SHA-256: d08ee55b35470dba4ff1dcf13ea74cc7c9188d8b063e1fa56385897dd4195bab
font_02_sfnt_off0000f671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF671 10328 bytes
SHA-256: b73234b8c6baa4dce0b23bfaa2e84340d63a1d9f2f1907ea43cc20748b2a6a11