Malicious PDF — malware analysis report

Static analysis result for SHA-256 a684fe38e376444d…

MALICIOUS

PDF

77.5 KB Created: 2021-10-10 00:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e83cc20c0379627e0e73f646e1040e08 SHA-1: ce87960e40f10397a540b4aab13bedce8a7e3303 SHA-256: a684fe38e376444da63940ec4438024fa4d2039f614ce453ba6969f1f360097a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to distinct, potentially disposable hosts, suggesting a tactic to obscure malicious destinations. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/ec82f636ff5cd310d73fc6ffc2c2eb27/kenodava.pdf In PDF document text
    • https://bostaninsaat.com/image/files/66669713492.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/kejotatipu.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/sogofiwu.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/zosenewale.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/zejunit.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/rogusofilixuzek.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/fugorepe.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/86434886231.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/49929653528.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/312772127.pdfIn PDF document text
    • https://petek.biz/resimler/files/33233448122.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/47205056291.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/47456177705.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/fomexamexako.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/nizabibarotetexere.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/waxorogakadixeresubozavek.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/siwanirixutefejutupipowob.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/3g2ulk3o8k424sr8qtjd4356q8/vifaban.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/63948040093.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/48146222029.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/55396279671.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/93518010007.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/zijavukebamavimexafu.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/sipabovowixodakegetujita.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/newadexusofigibusuloviper.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=watch+47+meters+down+uncaged+onlinePDF 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_off0000c7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DF 11124 bytes
SHA-256: 9580171a7884f89a73c7d9678d6130290b4546674c2802cc4088b6250702c2ae
font_01_sfnt_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AE 17892 bytes
SHA-256: d56760d390067daa837110ca40987164d0d9396d2261feb52fca63543e32df57