Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3be0a1832ef389…

MALICIOUS

PDF

104.1 KB Created: 2021-10-16 09:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3674def8fbbce7b2016b9b02fe811ed4 SHA-1: 237ca4e2217481f3f493f4b696e42a642beef970 SHA-256: 4e3be0a1832ef389902465d8de97c3f40f2eda3f85d9c868d6c61c8abf46a8b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16158af7937786---lubonijo.pdf In PDF document text
    • https://peisheng.org/uploads/ckfiles/files/61353587e6bef.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/satifonisaxunamipajemi.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/ruxade.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/96677564810.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/perolibusikajiwiravuxesap.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/40073184548.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/tigeb.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/46109791988.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/99787780224.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/58611541388.pdfIn PDF document text
    • https://razredna-nastava.net/files/31479777034.pdfIn PDF document text
    • http://esangsok.com/upfile/files/rivefada.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/43847438290.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/noxidepojujupimezenu.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/funujavizudiloliwor.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/39874678632.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/70542327048.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/669034419.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/39109659730.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/3b5fbda5500130ab962553a7737a2625/38690748483.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/68891222959.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20211006_8B5458D34DE61445.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/80840271298.pdfIn PDF document text
    • https://arbormaster.us/uploads/files/76511731274.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210918084324.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/3842363438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/HKUGBsJGI0E/uplcv?utm_term=game+of+thrones+piano+sheetPDF 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_off000130bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BD 10616 bytes
SHA-256: 5f9e127d4752a163456d503df33c64cd7ca98caf702d12edf4e4a2c2b209a3f6
font_01_sfnt_off000148d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000160e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160E8 19232 bytes
SHA-256: e0c79a6ba3093341727dc931222e1de0b2d2113be723a1f20052b1abe9796271