Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e7491d8f302ff9…

MALICIOUS

PDF

86.4 KB Created: 2021-09-16 01:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 303da0aff1d2dc2808cf3dd18ff79d83 SHA-1: 7294885d4c271af33bfc37e93604e12c3fbd67a3 SHA-256: 72e7491d8f302ff99248dd286daba83322c242f2cb8b4ee15f53110659ed834d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to external URLs, as evidenced by the numerous suspicious links found in the document, some of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://oniceh.ru/uplcv?utm_term=check+your+english+vocabulary+for+phrasal+verbs+and+idioms PDF link annotation
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/vodefurusilewakag.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/69684408975.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/turajinoxesaz.pdfIn PDF document text
    • https://ikansambel.com/contents/files/lanikoxotugaxikigimusi.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-8/20210908114914620442.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/wezidasaxibogujo.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/90384732961.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/ditowivisejo.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/95579642944.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/59576940999.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/gajoze.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/32527574802.pdfIn PDF document text
    • http://393citizen.com/upload/files/91070069093.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/f3d9ac4234d3a98c86611fedb9cab613/39575495789.pdfIn PDF document text
    • http://fohow77.ru/upload/file/maliwowupebigolejawudinon.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/wadimibelon.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/wolelumeve.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/80163117492.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/59695633414.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/nabamivol.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/52354232004.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/wabagijoxakafot.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/97971861537.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/dazifajuraduk.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/30983787981.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_off0000ea8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A1 17716 bytes
SHA-256: 6fd8aa197be6ec35119d19312f36c91a4ba93b8d900f0844139fda3d0ff61069
font_02_sfnt_off000130ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EA 11512 bytes
SHA-256: 242c15bb20c729a9ec42d4296b1a00295a7abd2ed409fa21df31a2aa889426c2