Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb10c777ff22ae7…

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 20:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e1b5b8ff533b1d6515c5141fd7ce39d SHA-1: d9dc17fd46f961677828ae5483550eb76e76af5a SHA-256: fdb10c777ff22ae70b0d6776ffa046aa78aa1a5100e4bc11219a171ca0c410e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous external URIs and links to disposable hosting were found, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are consistent with spearphishing attachments used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://archism.ru/uplcv?utm_term=pattern+lock+star PDF link annotation
    • https://paymentor.nl/uploads/file/26659647296.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/levasabonelalagusux.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/71599766940.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/wetutudemezezafagov.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/xatovuxenowidijamorop.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613989690bced---bivetuvesovigafazub.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/42043061884.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/suxalerimaserujob.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/73426239030.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/nirumabapa.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/zojinera.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///ranugesepadenepepajiwoze.pdfIn PDF document text
    • http://secretinvitation.net/images/files/vunujuf.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/jugupopebor.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/56703b29975ebd21613e6167958c3037/44623397747.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/puginabovij.pdfIn PDF document text
    • https://eguiders.com/uploads/12333778006.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/jopejariferalebujutixot.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/pedagijutapew.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/wakosupafoxawumidojoz.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/karekodusunovezalijab.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/kexujizepal.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/latemekimesisuj.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/75472627522.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/levobedasoxarufowi.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/vibekudapanetedukob.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_off0000e0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C2 10224 bytes
SHA-256: d2dd0a2eb7ba2cea50df373dcf096f23a9ba94665bd3776f1e7c490b379aff64
font_02_sfnt_off00010fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE2 18748 bytes
SHA-256: 80ed9e61da71147e6590ff7ed78c8014a4dc845e623867173c2c754a6c3da76c