Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fc96a2d5e9ad09…

MALICIOUS

PDF

81.5 KB Created: 2021-09-09 22:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 83ea1a33af1550f7d71de7b5c819be0a SHA-1: 4698d179f76851569dec0cc638614b8575e01df9 SHA-256: 10fc96a2d5e9ad09eee25ee2c514dcf9c61416a006d2b064c269da1f120b4fa9
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://philabc.ru/uplcv?utm_term=kingroot+chinese+version PDF link annotation
    • https://usssecuritate.ro/userfiles/file/58928752228.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/nuwemopazijupivujazelu.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109041555432586.pdfIn PDF document text
    • http://kes.org/upload/editor/files/12107663580.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/nowarapa.pdfIn PDF document text
    • http://travellerisland.com/files/nosadegobopima.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/dixelobesujub.pdfIn PDF document text
    • http://silver1979.com/upload/file/7723517035.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/rajumajoguzazu.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/miguwezuxogadanuzakufi.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/barabodiziwiwamopepud.pdfIn PDF document text
    • http://iscelenie.info/files/file/ligofusutekisa.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/78983476836.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/82308995028.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/15524747551.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/wigixeraxili.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/zuraxujosalot.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/sobafutem.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/82856387074.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/fegepot.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/wedix.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/18810555150.pdfIn PDF document text
    • 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_off0000dad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E7 10360 bytes
SHA-256: 806095be48df605e4a2348bdadbbe9b170973becf07210adf6aacfe52ff3f12c
font_02_sfnt_off00010a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3F 17776 bytes
SHA-256: e4924e48ef946bbf97c730aec1fb0cefd18a225761a4721c94de53fcd4f48795

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