Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55180518948883e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 14:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1df09746a4aa93c9eac939b482e1467d SHA-1: bb01698d8c8ab7a4adfa243ef6986bd741775a8b SHA-256: d55180518948883e928c4c8d710e93192b16e6c1cf3bb524d1659cd86c0ea6e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://aggengr.com/uploads/CMS/file/denosulogaxi.pdf In PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/gewunesefovafuxokafugenax.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/migupujarewor.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/xaxifodubax.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/53de4e9372b7362abd148d85a623432c/wezuwopitapelijijironox.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/fovetijonu.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/17866471956141a731cd7bd.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/68826774859.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/69370239822.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/zapofoganepusorugovum.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614267853c6c3---76009132757.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/ribawavanojo.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/61179988899.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/10412122035.pdfIn PDF document text
    • http://findusafranchise.com/files/files/gixakotiwuz.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/66568834218.pdfIn PDF document text
    • http://1careglobal.com/upload/files/20141660671.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/sesazojavokejuzarosigu.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/remetozovopurif.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/mujaveregi.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/jubitisixul.pdfIn PDF document text
    • http://rc-modeller.se/images/file///josafatawomatezexupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+connect+ps4+controller+to+mobilePDF 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_off0000dbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE6 17488 bytes
SHA-256: fd89216610c43c598a649063eccb77220eecb0f2c528ac9d6690dd30d50a7753
font_01_sfnt_off00010901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12118 10668 bytes
SHA-256: 02ea302751bee1de2564c69b6467fdf66fb51aa988cecc6454fe095595b3b33b