Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb5995ea56ebd8d…

MALICIOUS

PDF

68.1 KB Created: 2021-09-17 20:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 53e11fa851aaf7aa460ce118ec1af3ed SHA-1: d6cf71fd20388070e0b58fba4786c25b0ff7b3a2 SHA-256: 6fb5995ea56ebd8d0c3c7f710960136d4789523662d086369e955bae025e9cb9
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF is identified as an image-only lure, typical for phishing campaigns, designed to trick users into clicking embedded links. The heuristic 'PDF_IMAGE_LURE' and the high ML score strongly indicate malicious intent. The embedded URLs, such as http://avvocatoandreabruschi.it/userfiles/files/81025152835.pdf, are likely used to deliver further malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://avvocatoandreabruschi.it/userfiles/files/81025152835.pdf In PDF document text
    • http://ogledalata.bg/uploads/pages/files/wogow.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/29242055499.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/47608266908.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/bovigugenog.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/ligarowanamomazibaxepejob.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/42826821126.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/gefofegeduruja.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/qsep6ivflsdjen6a6vdebgneoa/xapitesifadisa.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091400585273499.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/54991313556.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/zerutuzuzuvupusaz.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1631877766.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/97695353922.pdfIn PDF document text
    • http://kaies.net/upfiles/file/5726947422.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/79704016134.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/76caf202bf9a3a2550fb705d2e5f8175/55748871737.pdfIn PDF document text
    • https://paradigma.bg/uf/file/xanoputujesewujelaram.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/sivomijejugefeda.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/vavobasa.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/66557836522.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/tazazugusidusir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=2k17+android+downloadPDF 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_off0000b0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D7 14144 bytes
SHA-256: ceb3f49cf39ccd2691d370a2acb3f24e5629fc23fc3c7f074f8c3fd6a654c0cb
font_01_sfnt_off0000d42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42A 10148 bytes
SHA-256: da44fd7bc53841bde5fb2cd47b0334c503198bf8c93c1ea183579db01dc481dc
font_02_sfnt_off0000eb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1