Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa42572d479b2597…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 04:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 83fd402e4a252e88457acd457412a1d0 SHA-1: d93f8ab7cc35541f670ead163da333a81d9a9f4c SHA-256: fa42572d479b2597ef6921086454eb952fd2697cf01e1c1efa1e65bb2fb532a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded links, many pointing to potentially malicious domains, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of numerous external links strongly suggests the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://qbcar.ru/ckfinder/userfiles/files/kibix.pdf In PDF document text
    • http://magogaralbamoble.com/galeria/files/81080255264.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/34616855508.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/petaravezilolokizawewibeg.pdfIn PDF document text
    • https://revive.fashion/upload/files/jofozidaloxukirajozo.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109110508417917.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/toxowurezokediveretur.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dffbecb5b---90385724491.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/47726661347.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/dulabivonireza.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109031251227573.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/73422248252.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ba543md35aqimmif58tk6qggp/purememazegodatonig.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/44613509491.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/pojagilogela.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/vafatuwudetabur.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/79530257318.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/96735864306.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/83997095984.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109140746216995.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/lunaxizage.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/99197621156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=batman+dark+knight+rises+android+gameplayPDF 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_off0000cb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB55 11096 bytes
SHA-256: 70b9b0edb0dd947f68482f788ee1c8f00127b1f634db597d05b84f7e98995048
font_01_sfnt_off0000e4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEB 22528 bytes
SHA-256: 4bfc2bf53351f377958c6f46d1bfe39bd10848339434172e70c7c65b59312c14

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