Malicious PDF — malware analysis report

Static analysis result for SHA-256 9403738ef2eb237b…

MALICIOUS

PDF

77.3 KB Created: 2021-09-11 11:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c2a651ef89f0f9bcba998ec8a2349de6 SHA-1: 1650ac9c0201238c5fa39e3e4d5912ad43dff33e SHA-256: 9403738ef2eb237b96375c06566029818bd6c49f2f26177f2fe47ad0faa130d7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=tamilrockers+new+link PDF link annotation
    • http://www.offshoreyachts.net/web_upload/editor/files/neguvaduxuduzatenerep.pdfIn PDF document text
    • https://venus-forever.com/image/files/97011993975.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/78351496567.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/62443394471.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/lufidixovuju.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/mepukuj.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/1554867242.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8d83f2e63---30160871224.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/rasixomuzowalotizu.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/84897477849.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/41823611880.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/mukuwazudinifebimulut.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/nojigobidezetezoni.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/41452648943.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631329986.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/zezozifisusavov.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/81609393054.pdfIn PDF document text
    • http://abworder.com/uploads/files/79763047516.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/depopigatew.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/74770957514.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/35527879560.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/wofewejowuvazaledi.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/11044851952.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/41570862139.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16135e64b46061---fijezusob.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109030845139024.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/89663428045.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_off0000cb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 17508 bytes
SHA-256: 6a32d8e0e9da220f5764e3973e17cf4c6d267b79aea22e6de74004f547fd10d6
font_02_sfnt_off0001100f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100F 10432 bytes
SHA-256: e1948a49e7ada60f5462b0468d5aa16724108fd0b63f36417589c4dd4678fd39