Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb09ccd10a9e879…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 21:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6403d46104c9ba4c4d68f139757c3faf SHA-1: cc80e42b4500ce2640d0bed6fd2b35a0afc4baf4 SHA-256: 3fb09ccd10a9e8793c498f134f11cf25f02b0ac02bea4b462acdde8f65c539e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The PDF structure and embedded URLs suggest an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=shadow+fight+2+ios+mod PDF link annotation
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/51844635920.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/tebebol.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210902091102.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/bizitutewo.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/746e5c83daaf27b2e15d0e51cf9c10d8/50465121002.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/13371769258.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210909_310FADA4A8F2804D.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/xufisamegodola.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/magejerixabapididuwina.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/46001074370.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/38877675669.pdfIn PDF document text
    • http://kmsenior.org/file/files/45994765231.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/75091628576.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/77591451259.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/1f7cb297df5e47b7aa4e2e972cdc3e93/jaxukukibakijogukiniwik.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/tijugimikirowilefevu.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/xugazavaxawufam.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/minube.pdfIn PDF document text
    • http://tid.vn/upload/files/72203885860.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/88281517651.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/zibuxorisifelubob.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/vexipexowopedonanumakutet.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/18690403459.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210901110131_5pburj.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_off0000d82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82C 17808 bytes
SHA-256: 37450c0d53aa804510d49f50a23d252f90be6a4b1c132e86a47e3e9a430d1112
font_01_sfnt_off000105f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F4 10700 bytes
SHA-256: c144094aa223a791ced96e270c70687454c1133b1193638b287ae973c3a3da9f
font_02_sfnt_off00011e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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