Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3f1f28530df08f…

MALICIOUS

PDF

82.9 KB Created: 2021-09-12 11:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 47e460c657298d304a56fb1b3ff58717 SHA-1: 5659d2b18e9d23f3b68d2029e4f366a8deb02087 SHA-256: 1b3f1f28530df08ff500fa0cee9268f95dce0f90996d47ed6b4b8c6034357abb
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, as malicious and phishing-related. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=dream+league+soccer+19+unlimited+money PDF link annotation
    • http://ajivikafinance.com/userfiles/file/gosadetovugosadisudoge.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/vatovuboni.pdfIn PDF document text
    • http://schokozentrale.de/idata/55785934741.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/74548248234.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/mebisirosit.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/sugefosolimu.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/xezezi.pdfIn PDF document text
    • https://festacontinua.it/public/file/11951379684.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/46097073119.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/85050908303.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/10/xugapuladalagemuzurujagod.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/62811058857.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161396a9580e46---81280822307.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/bexilokazaduwomapam.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/jasav.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/lakazadumufimaduso.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/defuj.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/29756076315.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/92679970786.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/74876881196.pdfIn PDF document text
    • https://akemi.ro/hirek/file/susudewupazat.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/bqsa9s09bp1midbroajjo9dti4d6g25i/xebeletil.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/bobiwokoguguxo.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/9723275093.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/90836742736.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_off0000dbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 18660 bytes
SHA-256: b942ea981d1eb10edd16151248b5917978698b9baa9182c28deac843af958b16
font_02_sfnt_off0001241c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241C 11148 bytes
SHA-256: 4cc482a79a18bf779303ce0e9fb49e9403e6a95511350e0b7f221c2b15e08b29

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