Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd5bb975dfddcb3…

MALICIOUS

PDF

88.6 KB Created: 2021-09-20 07:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 492326a818edf43cb7a44b763002573b SHA-1: 71635271b574f69c5ed88eafd1fb2930d2000fc4 SHA-256: 3fd5bb975dfddcb3c952c77ee682e874475bbd56131b7d8e5fff93eeaad74ad5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to suspicious PDF files on various domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://newsru.md/upload/userfiles/files/setexipi.pdf In PDF document text
    • http://emekyesiltepe.net/images_upload/files/satepemifulalelodawajow.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/35980888117.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/43588270037.pdfIn PDF document text
    • http://apicn.net/upload/files/1267563829.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/sowagobagopep.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/betalugo.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/6947432291.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109141156007190.pdfIn PDF document text
    • https://ms01bet.com/contents/files/12834350210.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/32863503567.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/mosetinulonutilarepokuti.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/0vks9vm7s9p7jhsros1ds4m0nn/zuzoxanovenu.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/valujafanumuwa.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/4825546579.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613452046f47a---15007183740.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/disevelevakodovuxixexab.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/rilamuridoni.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/gowavoxadefelij.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/befudatubuwerekasalo.pdfIn PDF document text
    • https://staging-info.sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/xoterojuv.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/zawedivopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+secret+diaries+of+miss+miranda+cheever+pdfPDF 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_off0000f196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 19060 bytes
SHA-256: fb5f9d29bef38fd5ffb8c7145a09366aa40926f212596b0cb5aae1b4501faf00
font_01_sfnt_off00012388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12388 10868 bytes
SHA-256: 253a4e2e6f78aa09229904a38fd8204cc8bb6681bd4dee58c5e49dc242d36c2a
font_02_sfnt_off00013c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1