Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b95a28c3b057ab…

MALICIOUS

PDF

79.1 KB Created: 2021-09-21 21:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14a9c6bd155f00f68aa37165f4909d64 SHA-1: 94a3477363aac3fc6dc959da659814c9550144bb SHA-256: d6b95a28c3b057ab0491d9e836b3e3c9f732781a72b6685271c33e6a01528593
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous external URIs and embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a redirection scheme. The primary function appears to be directing users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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
  • 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://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://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_off0000cd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56B 18284 bytes
SHA-256: d3594afbea2742d74e2b1c058ee38a34664d192e32c7dcc9d2ef81fa88967683
font_02_sfnt_off00011416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11416 10600 bytes
SHA-256: 77a65a4df6301e0949d66a6e94f33d9f7a394ec4435c231b974cdeeeeee368b8

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