Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d7494815e50646…

MALICIOUS

PDF

94.5 KB Created: 2021-09-22 13:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 173ecf38f532b269d76383d92ac3d1a2 SHA-1: a54cc9bac139d8c180c1642dfac4785c7227b451 SHA-256: d8d7494815e506469d4edc0dc825ad7a261ae58e85fb2c0072094a522c29f760
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured in a way that suggests a link farm or redirection mechanism. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a tactic to distribute links across disposable hosting. The primary attack pattern appears to be using the PDF as an attachment in spearphishing campaigns to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/42441978046.pdf In PDF document text
    • http://marsalanoleggio.it/userfiles/files/pujanajisadajujufepexo.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614350d59512a---73223695331.pdfIn PDF document text
    • http://hanifeugur.com/image/files/63562525491.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/38134098511.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/batome.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/wijowako.pdfIn PDF document text
    • http://dsfly.com/uploads/files/20437425371.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/gekiboxisufafuxemir.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/10920300848.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/kanuwibasebizizerigipas.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/96186761046.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/pisajajupuri.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///51283378602.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/bofipizarinunojijap.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/nudorekitakun.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/wapukun.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/podulunixaxelavijedabuwaw.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/juwoli.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/gotizaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=juegos+tablero+androidPDF 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_off000109ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E0 19776 bytes
SHA-256: 475bd1aeeb03d2ebcfca3328dc37e3c55b615cf575b64b00667843c1efa1f8ff
font_02_sfnt_off00015481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15481 10656 bytes
SHA-256: 1567cfad91d35d4202a44fe02fad144f44d78e12d18e7358d151530e704be557

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