Malicious PDF — malware analysis report

Static analysis result for SHA-256 33247887dbe262b7…

MALICIOUS

PDF

77.6 KB Created: 2021-09-17 03:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 70274cddbc076c753106985dc11e9c99 SHA-1: 55e2a6fa482a11ecb96dd25192377734a2574a9c SHA-256: 33247887dbe262b74b1c395e82525fea6b5b905bc2f29356f46b1b12c036a90b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, potentially leveraging JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://hkalc.com/userfiles/58051980668.pdf In PDF document text
    • https://electroagro.es/pub/files/gonosusinugatokivakubi.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/wenovosipututiweti.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/bemojelekupovomojamixikus.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/93091222954.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/nilapetemaxebezo.pdfIn PDF document text
    • https://harmony.im/userfiles/file/zuxopakanariluv.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/dkchh4flnlr4h7t049oumn0vn8/33494660816.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/9269691816.pdfIn PDF document text
    • http://crediramasrl.it/public/file/negudula.pdfIn PDF document text
    • https://norservis.com/files/files/mawezogogovatojunivu.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/0829c996a7c9d61fe05c7e41718f1259/sakexu.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/wojawoxubosejazud.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/72362260793.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/mojojonaxulumigelidudeme.pdfIn PDF document text
    • http://home-plast.ru/foto/files/29464838782.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/10358477523.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210901064852930918.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/10127948672.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/tanutebaxadupusovaxape.pdfIn PDF document text
    • https://gdwtechnology.com/fckeditor/file/In PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/lomivago.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210907_A29723CAF13A5975.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/fumabamur.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/kumewanonalomojux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=photo+compressor+apkPDF 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_off0000cc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE418 17464 bytes
SHA-256: 8a6bf8fcf72c439690c219b3f3b1d9d33f8804762b91a480ec17bdf0cdee67ef
font_02_sfnt_off0001116f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116F 10492 bytes
SHA-256: 89635593175d875b959ae30b59b3c2f76ccebdf6eb18120aa18733d67588c979

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