Malicious PDF — malware analysis report

Static analysis result for SHA-256 319be69e8c57f69a…

MALICIOUS

PDF

71.5 KB Created: 2021-09-16 01:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 647617d83459898be9642067d9bea22d SHA-1: 773ac082e2035fd2baad0994ac7cbc131702c2c1 SHA-256: 319be69e8c57f69a5c8d8adbeba0cc84de29c0ac6c9aa252ac8a10806157539e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning model and ClamAV, indicating malicious content. The PDF contains numerous embedded URLs pointing to various domains, many of which are structured as link farms. The presence of 'utm_term' parameters suggests an attempt to track user interactions, common in phishing or malicious redirection schemes. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://medvor.ru/uplcv?utm_term=pac+man+championship+edition+nes PDF link annotation
    • http://s2ipower.com/survey/userfiles/files/2193320189.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/lajufogafak.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/66744896204.pdfIn PDF document text
    • http://vecsecity.info/editor_up/77793194479.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/41442650879.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/18409985743.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/bureminosupejewo.pdfIn PDF document text
    • https://jin-ji.com/upload/files/86671011658.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/88376490679.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613415aad774f---56008402665.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/bibexiredikumogupamigimip.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/wisonewose.pdfIn PDF document text
    • http://yepuco.com/uploads/files/28385134523.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/16928596450.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ce2605279fe3326fe6d97c14ed4aec45/vugoneduloparosano.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/guxukiwigasosumaviwi.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/xusoberotarorigabun.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/fifanonagorirozodejukivex.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/10540223968.pdfIn PDF document text
    • http://dgkno.cn/upload/73725178821.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/vixolog.pdfIn PDF document text
    • https://rosycaffe.com/file/nexobavezedumolib.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_off0000b3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B5 10632 bytes
SHA-256: fc304b279d802d9e07e311ba6f818b362cd080f19f19fc1f3b37f4c6909fe2e3
font_01_sfnt_off0000cbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E9 17204 bytes
SHA-256: 5541435e9c42f298fc528ca61e6b05bf46b05f5106ac4f78a22249fd1b57d5c3

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