Malicious PDF — malware analysis report

Static analysis result for SHA-256 d302d19a9f37c18a…

MALICIOUS

PDF

71.9 KB Created: 2021-09-18 01:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 245225dc0753eef499ad06b92839f360 SHA-1: 4e627eb82bb9855616740ac6b34d0c4ba555b461 SHA-256: d302d19a9f37c18af8e8ca42bc9384335272b783114c46d2ecbf2a618d59532a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URLs, many of which are associated with file hosting or potentially malicious domains, suggests an attempt to redirect the user or download further malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vaynhanh365.net/contents/files/wuzudij.pdf In PDF document text
    • http://aprt1day.ru/file/miludupaxudosofito.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/42596168971.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccfd9a3345---jujitoxanixujup.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/2024993322.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/joxurolenuw.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/9029827328.pdfIn PDF document text
    • https://merlak.ru/userfiles/file/33596555475.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/16970401003.pdfIn PDF document text
    • https://irantruck.ir/data/file/35377844076.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/nasewosaleki.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d05fa4825---26467508284.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/wazijoluwo.pdfIn PDF document text
    • http://vhktn.at/images/content/files/gopol.pdfIn PDF document text
    • https://subarini.ro/mm/file/gasoxepadibizawoje.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/wedugopafewezuxapo.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/51193937486.pdfIn PDF document text
    • https://architektor.ru/uploads/file/kujejubuzerinagaraf.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/pobakisudiwabuvopizejex.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/51499725531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=what+is+gynoid+fatPDF 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_off0000b8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BF 16380 bytes
SHA-256: 18a3090448ed5c1c57d44920ea5f7d40642f61b2497662609d1e15bdb109e4ce
font_01_sfnt_off0000e292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE292 10464 bytes
SHA-256: 46b2d09f72708bb14fa6aaffba654528ea0880cc06c3a09e8c4c99dbf88827b0
font_02_sfnt_off0000fa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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