Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ecaf33940e60525…

MALICIOUS

PDF

72.2 KB Created: 2021-09-24 04:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 96f8c2059c990d7652139c8c674ed812 SHA-1: cf68e038433603b1b472070ccbd1adf4fc5f4ee8 SHA-256: 2ecaf33940e60525d43b38e07608722c81c4b9424c60e9f32c33e397110b51e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://giaiphapthietke.vn/media/file/files/29274942129.pdf In PDF document text
    • http://albino-pitti.com/pub_img/file/46055575756.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/31747767080.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/vefevunokinubuluxutidilem.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/935814048.pdfIn PDF document text
    • https://vendax.ro/files/file/garimomefobusasotixu.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/87326480377.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/ralomemusexojobikezopiv.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9c7879cc---kojigen.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0e25f45bf9b1dbad1ec44fcdbd1cf2a6/59974231645.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/dujiwufebisopifofebev.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/jexoxudi.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/wijeluxidetososek.pdfIn PDF document text
    • https://digireg.es/upload/64449023740.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090417173175.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/gixavifatewarolinepefa.pdfIn PDF document text
    • http://uhorder.com/upload/files/vonexujuporokafawezil.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/natupo.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/30229744889.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210909_2AB9C2607A9ECBD7.pdfIn PDF document text
    • https://ons-station.com/editor_upload/file/pamobutubasi.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/wugugiwetok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=train+to+busan+2016+torrentPDF 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_off0000b31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31E 10720 bytes
SHA-256: a55dadd546db35be09a99fb33353ce565ed88c30a0df2341e8be921901e5f6ac
font_01_sfnt_off0000cbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE409 17912 bytes
SHA-256: c126a3a042ab570ea3a4c5f7922cbe6753538f6be123b5399c4b788ba4d846ff

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