Malicious PDF — malware analysis report

Static analysis result for SHA-256 897fa4181958b8e4…

MALICIOUS

PDF

74.8 KB Created: 2021-09-28 11:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d617f7e73ed0c44e2428768f219975ac SHA-1: 19c21dd9dab1ef607d34c10fbf93999f290f4117 SHA-256: 897fa4181958b8e4b9efaaecadf82309e49a31d32cd7367fc8850b69d833bf59
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external links, many pointing to disposable domains, suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/44533436262.pdf In PDF document text
    • http://xmzhj.com/UserFiles/file/48216851123.pdfIn PDF document text
    • http://adice-area.com/pictures/files/41019033744.pdfIn PDF document text
    • http://plan.msu.ac.th/ckfinder/userfiles/files/28358695626.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/45551590733.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/devonulejakigifas.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fce40d7c28---94815513851.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/37765854030.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/59712500527.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1614017ef5e542---mirejugadakanim.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/jexobosorejegituj.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/39018308969.pdfIn PDF document text
    • https://yakin-surewin.com/media/file/3026169128.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/piretewigudasi.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/rumimabomiwevovalasovid.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/ziwibujosijez.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/51240346973.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/lamobomubuwejerixufowanun.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/rapivenufize.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/timapoxijawakuloziwisab.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/40086437073.pdfIn PDF document text
    • http://synowka.pl/galeria/file/34810436028.pdfIn PDF document text
    • http://egitara.com/upfiles/files/64593718603.pdfIn PDF document text
    • http://bptramptour.pl/files/file/48331419334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=descargar+aplicaciones+para+android+sin+play+storePDF 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_off0000bdf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF2 10804 bytes
SHA-256: fdb7354f499eadb56ac603cfae8aaabb85652935b15a5bc12155553a75a5de02
font_01_sfnt_off0000d6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDD 17784 bytes
SHA-256: ff9eb4ae1b8c39149c7a79ae40e614874f0d5c10d87df3d84b4483adb680f260