Malicious PDF — malware analysis report

Static analysis result for SHA-256 796429d3c4331ec6…

MALICIOUS

PDF

56.8 KB Created: 2021-09-21 21:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8e03c5f29a58f00d3a45b58f11349564 SHA-1: a3a06819835f5ce4dacbc428d05c580940d9e9ed SHA-256: 796429d3c4331ec6359fa0f13b9a0c4e389d86cdc83b2d6d6acf52d3faf070d3
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates the document's primary function is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5562

Heuristics 4

  • 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
  • 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://medvor.ru/uplcv?utm_term=android+conceptos+b%C3%A1sicos PDF link annotation
    • http://dezmaster.com/userfiles/file/garafakixolamimefirono.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161368b5aa0a74---63695476297.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/pugewisulodugunimudimed.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/62003328561.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/lukosujaxigogalejawa.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/61481490951.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/toladurenokupekile.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/523876e638f8ee1df6ebdeba9e4b9015.pdfIn PDF document text
    • http://keacg.com/upload/files/zabojojomagutatonifog.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/domefufojukat.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/15239533079.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/46597418020.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/54922979878.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/kezedegisexozadibebole.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/wagadatamuku.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/wotemoladura.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/bipisor.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/xipew.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/latenegamariregirulosalu.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/237747063.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/52694534897.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/wifapilamotozajorekuko.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/bavibepiwobuxefaje.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/ravefiruwuzaderapereri.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/juzixanasopalexu.pdfIn PDF document text
    • http://soupworld.de/upload/file/30400736543.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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