Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08b99d6c900d15b…

MALICIOUS

PDF

70.5 KB Created: 2021-09-29 00:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: fdffe2e48e7bc71622b4adc555ea8e7e SHA-1: aa32ee92e20542a7d08c0f436b19c95e3a8832bf SHA-256: b08b99d6c900d15b7487e6b452170ad7c2c7cafed39ffed87ad96a7db7a9406c
134 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URLs suggests the PDF is designed to exploit vulnerabilities or lure users into downloading further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using many links on disposable hosting, often associated with phishing or spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=among+us+fan+game+unblocked PDF link annotation
    • http://elitsatodorova.com/uploadfiles/file/safusatap.pdfIn PDF document text
    • http://polletnv.be/uploads/files/setaruwipomuvazanamufizo.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/8786627419.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/vipuwijisemador.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/7330507464.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/46099803310.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/78659791956.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/1130383832.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/80777992418.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109200451496468.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/97647215028.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/vonipu.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/nitegifirurix.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/vobodelizaxajuvige.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/texabuvijogexap.pdfIn PDF document text
    • https://xlquality.com/userfiles/file/73288756488.pdfIn PDF document text
    • http://chicopharm.com/upload/files/norelijidiverubu.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/monefusufubiko.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/96195529503.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/savisekagojulure.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/zemumisutukubogerozekebe.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/62115928218.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/41482476292.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/gunegirikizikofeganozog.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1665674476614821dcd5de7.pdfIn PDF document text
    • http://grupophi.es/uploads/files/dijajakoradipirotukunar.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614d15323887d---josazumelejabug.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_off0000b24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24D 15920 bytes
SHA-256: 983809e8ebf0dedb71675e14f221890bef30eedc0c6c8f9c629ffbb71ceb8612
font_01_sfnt_off0000db2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2D 10840 bytes
SHA-256: 4ab4adc33839de57b7ffe1e4a72891ada24a9c85b55cd771663eb84f3dd2713e
font_02_sfnt_off0000f40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1