Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca8ffac48b9c522…

MALICIOUS

PDF

79.8 KB Created: 2021-09-15 23:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7ec1fb1af070fd2914af5af160fce7f1 SHA-1: e2125b9fb1b42199d11c17e95015822e50366a37 SHA-256: 0ca8ffac48b9c5222d85ac3a28361547d3616d0553773a3009f919392f954dc0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous embedded URLs, many pointing to disposable domains, which are characteristic of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://armenia4d.com/contents/files/14857048057.pdf In PDF document text
    • http://teplospectr.ru/images/files/60216175202.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/sutobuki.pdfIn PDF document text
    • https://spyboarcams.com/files/91080969869.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/zawomopanafubudesemunebed.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/dazepoxomokodov.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/38886380217.pdfIn PDF document text
    • http://trevorhannant.com/defosukesa.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/4b8efc61bf290dd0c4b397249a4ed8b2/30550891641.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132523dba1fd---9936452410.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161355ffb89599---44894059674.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/fajurobubapuwogafapinub.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/xanuwupidalunejamazoluvuz.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631476582.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/92156352238.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/7522998273.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/70301363667.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/nilufivegaregelatidajibik.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/426919635.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/wodejamesezezakozabuni.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/66008620311.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/gewumupifodadanevabanix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=new+york+wileyPDF 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_off0000d971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD971 16388 bytes
SHA-256: 3e6c1bb9ec024efa630b341ec02ec263396f803f57c4691c0d74c5d5d1934b2c
font_01_sfnt_off000103fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C10 9836 bytes
SHA-256: c413bf7258aeb149ffe9d6a6da12acefca20b886bf879b0d6a3611b3ff9837de