Malicious PDF — malware analysis report

Static analysis result for SHA-256 45687f16e98bf811…

MALICIOUS

PDF

86.0 KB Created: 2021-09-08 18:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc4a103f687a8b53d237f59d754b64a0 SHA-1: c2f4105d3f6670e14a999f4f8fdf2c6e02f42dd4 SHA-256: 45687f16e98bf811f7944710f90d8ab150f2ce3a9ee0d2f550c637af0e661f42
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://wastran.ru/uplcv?utm_term=puissance+math+exercice+pdf PDF link annotation
    • http://easy-sleep24.de/shop/images/editorfiles/file/5957883348.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/60463272894.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/29706795311.pdfIn PDF document text
    • http://scro.ru/pic/file/sikisis.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/xeserakekabuguzimuvuzo.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/ramiwemirasifixemetude.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/bejamedexovutu.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/94533268058.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/zisuropebiwugelemupa.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/tegezofelagixerarenivav.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/khednoka2k358tjbq5um00nnb0/86132330562.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/sotupunifegopadot.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/13489551519.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/jivumilujapemonubunamazet.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/12834028408.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/36639812365.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/sowip.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16134aebae81ff---17469305286.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/zutizawonike.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/suwiwoluba.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/62428175652.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/38110359791.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/vijedifekebejiw.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/xuvupereraruvazadupug.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/50354661324.pdfIn PDF document text
    • 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_off0000e1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B7 21432 bytes
SHA-256: 7f0608ea7cd53ba5d2560d243c73a1cead29ae1bf80e20dd96713652dfc95a7a
font_01_sfnt_off000118ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E1 10924 bytes
SHA-256: 8f6f0c7334d816ae1898e00c8ebe0757496bdb13092b6dd165a0b4ea6f7851f5

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