Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed14a3e500876a23…

MALICIOUS

PDF

72.8 KB Created: 2021-09-30 17:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f91e7a8272caf7a14e9d1c67d3788764 SHA-1: 55c1002bac5032d5a572e507e30eab3e24b1cbdb SHA-256: ed14a3e500876a23236586979af01c27a840583aafd2112812f092c1a0832d40
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and configured as a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb6b90b348---tovaratedumubo.pdf In PDF document text
    • http://mikailang.com/userfiles/file/20210906144834_612887411.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/nogewilavifejaxu.pdfIn PDF document text
    • http://temdientu.vn/images/ckeditor/files/fitipemisojisu.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/42835815261.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/75660494685.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/dezikereranekidivi.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/67092975759.pdfIn PDF document text
    • https://nichebearing.leaddeehub.com/userfiles/files/lawez.pdfIn PDF document text
    • https://badrivishal.com/media/19805791114.pdfIn PDF document text
    • http://thecuriosityshot.com/besedazu.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161558a5a9ba66---tulogetokipop.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/jelunututepaju.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/bunapawuvorugivejafexinop.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/xinevejixawimepufa.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/gonaxap.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210912_050658.pdfIn PDF document text
    • http://ubest.ru/images/file/56587692959.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/99800376870.pdfIn PDF document text
    • http://decaiyun.com/upload/file/21090816385694104981insir4d672.pdfIn PDF document text
    • http://totoumi.jp/upload/file/betiba.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/desaperajik.pdfIn PDF document text
    • https://jss-moms.si/upload/File/numadu.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/21/file/jakegemurek.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/9067158096.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210914011635579395ynuybu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=signs+and+symptoms+of+hypoglycemia+vs+hyperglycemiaPDF 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_off0000b74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB74C 11320 bytes
SHA-256: 7dcbb6bb33ab49ead15a9477f035e488ef149516a0701591101f3df93181314a
font_01_sfnt_off0000d187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD187 16972 bytes
SHA-256: 57895d1b336cbda7c27ffb90e23d2c3a676eb81646881d720b86b0ac05d5702e
font_02_sfnt_off0000fcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1