Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddba4853f074f203…

MALICIOUS

PDF

79.0 KB Created: 2021-09-19 10:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c4e5e7f1bddffa032b1a92f7248343dd SHA-1: dc80887608c75a5644edb363d3831550b30e071c SHA-256: ddba4853f074f203a12fa268271497d22e46fb60d69d96fb2a2238e2e01e6c1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users through multiple sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://lexxyin.net/files/fckeditor/file/30759708857.pdf In PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/67005901208.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/89831836420.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/5771243846.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/63285757775.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/53655488922.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/ribuxadadag.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/68327331422.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f1b1450c5---63024989713.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/99322020721.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109040242307813.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/12199114135.pdfIn PDF document text
    • http://ud2-140.com/files/6096083813.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/37844296795.pdfIn PDF document text
    • http://amandamaitland.com/images/file/37830043922.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/i0udb5i22qmm2kcd5ienjl80hc/wilidetat.pdfIn PDF document text
    • http://tnhmc.com/userfiles/file/koterexeleni.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/xunusipuxifijovot.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/jilodomoporepek.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/45320901397.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/27611762595.pdfIn PDF document text
    • http://hangquangauto.com/files/82728959357.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/judunifofovufal.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/91803844754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=set+screen+lock+androidPDF 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_off0000d14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14A 17420 bytes
SHA-256: 762de54580b0b1227b4b98aee8f01fa52833b514606e13d87f137e6ccea7416f
font_01_sfnt_off0000fe18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE18 10528 bytes
SHA-256: 982924bab3182e6f79ad1065b4387c53a96a1d4a6f1989278ee43f4ce18f8c91
font_02_sfnt_off0001162b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1