Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa09184a9306f72…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 08:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2eaa132944bc259c7daf9ecea88a4669 SHA-1: 8d97f5a43562993d651b5f9867285a77c168293d SHA-256: 4fa09184a9306f72bbfede5380d343aa8edc1a59bff459dfac53dae79613f23e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and the presence of multiple external links suggest it's designed to lure users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://massimobertoarchitetto.com/userfiles/files/bidowanakunirixorixad.pdf In PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/gojefezilazoroxemepenura.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/gigifepesovudavenafugewow.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/jimika.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/12745347858.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/jafijetafozokokizobi.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/50402330969.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/zamatavamawobuduwug.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/67603484586.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/31687200817.pdfIn PDF document text
    • http://canadianrockies.info/files/file/28737893232.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/65068220232.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/36711142704.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613397079b018---31421601853.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/xuneta.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210910102739.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/30600263030.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/36595341969.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/nebesetabisa.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/79884463394.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/77069349054.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f89bb3cfe5---4937064119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=stranger+things+season+4+auditions+scriptsPDF 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_off0000d61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 18708 bytes
SHA-256: 22d4ab1f4381945bbb40a1a0d01e9f984056e522fd8c1505a6db340e722fc033
font_02_sfnt_off00011e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E56 11000 bytes
SHA-256: 836df2211173e0d3157f2242fd901c02de84a30923317b381def7478c786f5ce

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