Malicious PDF — malware analysis report

Static analysis result for SHA-256 a764f962d8687a4d…

MALICIOUS

PDF

71.5 KB Created: 2021-09-21 00:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 84a88fe95873cdbb3bcd374af0e1ab36 SHA-1: 48be7b13080f820004b8dfe31a3e128989f766c6 SHA-256: a764f962d8687a4d52bfaa8b22230a31e88f3ae834cbaf6e9214a94aa541a97a
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The presence of embedded JavaScript and a heuristic for password-protected archive lures suggests the document is designed to trick users into decrypting and executing a malicious payload. The embedded JavaScript likely facilitates the download or execution of the next stage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://legalinet.eu/userfiles/files/vojuwebowalazaxel.pdf In PDF document text
    • http://rld-carbon.ru/file/susepixaxikafemififumam.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/kaxisukunolofezam.pdfIn PDF document text
    • https://hujanuang.com/contents/files/dugalojibone.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/vikuliwemurowidutigibem.pdfIn PDF document text
    • https://eklyps.net/images/file/rufupuxakadepuniwosidotif.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/movojosasulila.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/964835135.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/17499444895.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/memefoxugotomujuraw.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/78855382336.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/18659561954.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/26944046287.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/54058081725.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/44782239390.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/37097363984.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/vibudunakewisitesafefefe.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1ff1a98f6---15935380214.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/gijubisibure.pdfIn PDF document text
    • https://premiersuli.hu/files/files/kesilagegiwamut.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/niwusavovimowulene.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/56553849428.pdfIn PDF document text
    • https://hoongnau.com/upload/files/47908122758.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/miwonidopubuxamixomibisi.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/suposo.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/xitex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+reset+your+phonePDF 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_off0000ba49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA49 15208 bytes
SHA-256: 392f33b716b336e8f5f33f54770c7b6a3bc767855ca554f48ff6f9bca1c6973c
font_01_sfnt_off0000e0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FB 10340 bytes
SHA-256: f73135d788bba4fccde79ac1ef342919527a1648fd6bb8c963d35293d4005f71