Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40cde07bbb45960…

MALICIOUS

PDF

68.3 KB Created: 2021-09-24 23:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e994dbc6e02250ea62ab8b24c222ee68 SHA-1: 70cac9b4d1363069dfde2300391423a7af3aa9bb SHA-256: a40cde07bbb459605ce9221aa3179b642ea9380536ddb4eff085650537203070
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous links to external sites, many of which are identified as a link farm on disposable hosting, suggesting an attempt to direct users to malicious content or phishing pages. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://futiandj.ntgis.com/UploadFile/2021/09/24/file/20210924_114407_154.pdf In PDF document text
    • http://m-s-g.ru/userfiles/files/86795426386.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5bc094f8e---65833303678.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/020258263338.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109062154019766.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/12778530519.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109191353233755.pdfIn PDF document text
    • https://migger.dk/userimages/file/60713628428.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/xaxiw.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/dalazolipixulivi.pdfIn PDF document text
    • http://intertravel.hu/_user/file/xazifasuwukozaviv.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/59188846055.pdfIn PDF document text
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/walakuvapenujetasumeg.pdfIn PDF document text
    • http://zl369.net/userfiles/file/fefexoxododajolumezobexin.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/11091620539.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/jeparu.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/govazipudilox.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210919111506.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/novabipo.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/liwunajitarusepezineteb.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/q31mdo36p36am13am5elk0eak3/luzubikonunenewaxudofoziv.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/difofetok.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/zonemogitatogetit.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/95126776516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=download+obb+spider+man+ps4PDF 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_off0000ae6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC681 10760 bytes
SHA-256: 37cc5fc2b987e22b02261b59d07a9c071d4ca38884ffd51ab3259591188fff3b
font_02_sfnt_off0000df08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF08 14572 bytes
SHA-256: d4460c159e67799d1d5bfac462188b24f8ecbfbecc258331fcc132796fc148bc

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