Malicious PDF — malware analysis report

Static analysis result for SHA-256 f376dec0c5103f36…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 19:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7a6ffda432532f7daa77d0d1437ed8a4 SHA-1: ab717ec25936d92f369d117850476464a6303615 SHA-256: f376dec0c5103f36c8c5b3fc61d35896c1e3fcc8cff61585383770ea21cd8a7d
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable hosting, indicative of a phishing or malware distribution scheme. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly suggests the document's purpose is to trick users into downloading a password-protected archive, likely containing a malicious payload, to evade gateway scanning. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://queure.ru/uplcv?utm_term=hacking+tools+apk PDF link annotation
    • http://cold.lt/userfiles/file/47845310897.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131dd0a95c7d---sobawerebotisosabefudisop.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/6615480283.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/komozoxutuzexarejewu.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/90558590564.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/55075285103.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/zafewa.pdfIn PDF document text
    • http://anninh247.info/upload/files/ganelaweb.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/rezerad.pdfIn PDF document text
    • http://sin-hua.org/userfiles/30212254755.pdfIn PDF document text
    • http://builderall.info/userfiles/file/loliz.pdfIn PDF document text
    • http://charivne.info/images/file/sevito.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/josotobup.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/lifujitaxudorenevasubalu.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae130337eb---8465858418.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/46477250458.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/pozogejikegarewosirawafaf.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/19682287429.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/5645600107.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/famepulovoxetumubotod.pdfIn PDF document text
    • http://nprofit.hk/userfiles/fijufekowuwupujo.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/60276881263.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/xetonomegeto.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_off0000d86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 10400 bytes
SHA-256: 4b237ffc4b1625c66ad493f5fe57f911ec71e66c0911e9ea0be4cfcd84fb12d8
font_02_sfnt_off00010825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10825 19944 bytes
SHA-256: a04519e8c0408fcd6f39ccc85b49b0b96cc2c2df630ce9072fb92bc23c5e0a80