Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2ec6fd07cdfa46…

MALICIOUS

PDF

78.3 KB Created: 2021-09-22 09:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 596ad3c4cafdc2e8845058a63ace92b5 SHA-1: b14dbd4042952acecefc921d97840f2f3aee4529 SHA-256: 4d2ec6fd07cdfa46aa8ae67f7bb7795a41019371baa8b8dd4513b82481846b09
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=marshall+mcluhan+galaxia+gutenberg+pdf PDF link annotation
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/73520346085.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/53744051176.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7e7c3bf49---rebegusipaxipevezelokoxul.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/pebefagipixobuk.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/4508587253.pdfIn PDF document text
    • http://symbolfoods.com/files/file///nafalulafo.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614acb3457f61---jawifefinonela.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/tisomamasarijetofekil.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/14017041598.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/bukokozamubudeloxed.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/77654856360.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/23827987070.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/ludok.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/nolanepizesurosuxilovux.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/85957090133.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/20219112231232010.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/bixeburuzakutovolabiraxi.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/70500272456.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/xulefekufojixob.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/97605193131.pdfIn PDF document text
    • http://centronegozi.com/public/11532805385.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210919133624_op4yc2.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/8424748064.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/kefezoxaxizuwijejelob.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_off0000c9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F6 11280 bytes
SHA-256: 036949beefdc44782b0ff64da0d047e18c43e21599c2916a889f9eefdd7b5677
font_01_sfnt_off0000e3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D4 17628 bytes
SHA-256: d2fbef6814f670999b591f9bc5c919f508378b9980e5a16377ae79a2cb9b4cc5
font_02_sfnt_off000111b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1