Malicious PDF — malware analysis report

Static analysis result for SHA-256 2404307bbeec7dac…

MALICIOUS

PDF

83.0 KB Created: 2021-09-11 03:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c894348ce27235553bdb94e7d9ba76cc SHA-1: fe513bd1a9803c56218c5e8e8d00ba84303168df SHA-256: 2404307bbeec7dac99151c6a94cc9d833b50a435fdc4d475bc01c04fc2773797
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users. The presence of these links and the overall detection indicate an attempt to lead users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://mysmartedu.com/uploadimages/files/valoxudeguzawim.pdf In PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/jegigajegorujuranofiz.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/limeralotesubebevusiv.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/27991540290.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/12572680276.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/jupuxasakusi.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/dewimegitot.pdfIn PDF document text
    • http://lj-group.cn/upload/files/rumimasif.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gugeboleve.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/79032699832.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/zavemufaj.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135d12bd69d5---xugidavofubelodalo.pdfIn PDF document text
    • https://advik.net/userfiles/file/topelulaguteduwikaxogolib.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/nofajinupejopumeb.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/paxezavukozug.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/mimumada.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/75308559924.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/gapipewotozetanepezeve.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/98768210161.pdfIn PDF document text
    • https://t2sc.me/userfiles/5472487890.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210910083140.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/77012437586.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/922hadpvg52mmcpkq482sp5ikb/xadodef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=hay+emulador+de+3ds+para+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_off0000dbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD9 18832 bytes
SHA-256: 529d37c4738be50b1f44bde584afd1d96f546c90d54f554d66816d15d71976df
font_01_sfnt_off00010bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D3 10832 bytes
SHA-256: f91b4ea870b866d29f06aeb6e66508153821dc00f483a96c57832127226c1bca