Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72da91abf799186…

MALICIOUS

PDF

69.8 KB Created: 2021-10-03 14:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 936b0937927f8d91f1602949fae7e2bf SHA-1: 8c358e1e2bda6d4648eed670dbd14f49dc0d5e91 SHA-256: c72da91abf7991863e073bc87f527e0714e579934c8ee8ee6499c45959f9f9df
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Heuristics indicate the presence of an algorithmically-generated URL and that the PDF acts as a link farm on disposable hosting, strongly suggesting a phishing or malware distribution attempt. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://faresaldabbous.com/uploads/files/81274340277.pdf In PDF document text
    • http://agataklimowska.pl/userfiles/file/18044340535.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/jitokerufobe.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/bemidoroturamakil.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/vurerafajapepagifu.pdfIn PDF document text
    • http://www.polni.si/Images/files/5062434176.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/37934230374.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/31914705355.pdfIn PDF document text
    • http://japhina.com/upload/file/87177300284.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/17110796745.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/33425778208.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/xaguvabazaro.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/47758442864.pdfIn PDF document text
    • http://goldia.cz/data/file/13013005704.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/80761015920.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/12971726375.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392ec176aab---sagukejosabeminitino.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/gerapelevirefod.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/37282696045.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/56086442202.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/dd3495f9532a4926dce1ff5fbb8bccac/zazepupalorogul.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/bupofigi.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/32658932134.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/vudilozoseka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+curious+incident+of+the+dog+in+the+nighttime+pdf+downloadPDF 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_off0000af8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79C 15488 bytes
SHA-256: 9007cc7c09f0233015838f2a780b4a08d297a298ab85acf8e4d50d33779b9fa6
font_02_sfnt_off0000ef4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4E 11216 bytes
SHA-256: 2921a45f499870b12421795f5ac0e1c63d097dbbbc1e83723e57b9bf3b427eba