Malicious PDF — malware analysis report

Static analysis result for SHA-256 497e280b2eb15f97…

MALICIOUS

PDF

68.4 KB Created: 2021-09-28 15:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 98ef5c1a6d07af7ea434033a80e47e8a SHA-1: d94e154492eb68f13a872d4200597440a8e5cc9b SHA-256: 497e280b2eb15f97aa735bf8022788ebf68d71257cd5391ef63045114f2a069f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its structure, containing mostly image data and a single clickable action. The heuristic 'PDF_IMAGE_LURE' confirms this, indicating a typical shape for a phishing attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 0 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://khautrangkhangviet.com/upload/img/files/83962519264.pdf In PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/fibojo.pdfIn PDF document text
    • https://emmaushuis.org/pages/17160042738.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/78106480175.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/96613158208.pdfIn PDF document text
    • https://paperland.bg/uploads/file/98910574558.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/takozitukerekezafuwomod.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/47983480765.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613a620187ea1---40110637366.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/32874492665.pdfIn PDF document text
    • http://jcsh.bluezp.com/ckfinder/userfiles/files/jadarezujivivulideripuzum.pdfIn PDF document text
    • http://sodrex.pl/userfiles/file/savalogojikozapikav.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/kogitapurepedagalopokugof.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/refeniwumisejatol.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/58410845800.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/36534129177.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/25095324819.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/dexifinifiwuxunixumuda.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/48871843379.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/44097603488.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b7nn4o6d37re9q8k4pqreqgfp/88492943496.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/bezoliw.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/29918572898.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/rozezaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=past+simple+past+perfect+past+continuous+exercisesPDF 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_off0000af9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B4 10844 bytes
SHA-256: ded0dd3ce798f5526407f9ea01d55ba665648a7252d9b36022202064446132ce
font_02_sfnt_off0000e0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BC 14112 bytes
SHA-256: 7fbc7802e8d267f2c19f3fe1a86894199ab003b0da6f0705348df4106a3d0778