Malicious PDF — malware analysis report

Static analysis result for SHA-256 45317c6f0a5e3861…

MALICIOUS

PDF

78.2 KB Created: 2021-09-10 23:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 76c9cab38d67a34f3da8697e478c3d41 SHA-1: 285bed51013c83735399baf53c7c067b18cbbbee SHA-256: 45317c6f0a5e38616d560f3f1d69ac77d81be610b01e399a3067fb4385f49bf9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs further support this, directing users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/maligimaxibudosaparodigij.pdf In PDF document text
    • https://rumusjitu.com/contents/files/rexilidivijagujig.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161389ff894204---rimagugag.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/48442874343.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/28506720542.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/35428915172.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/wefulowugoda.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/gilepuzudezuwimikudeku.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/ruzititerobu.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/29278217706.pdfIn PDF document text
    • http://reopen911.info/media/file/poguzulepav.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/1119336304.pdfIn PDF document text
    • https://wmu24.ru/media/file/jexetuwulemideretugupep.pdfIn PDF document text
    • http://bjjiffy.com/upload/81409736267.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/nifasiwogasokijuraxumobuj.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/baludubanijojug.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/2462547ae43e3bafccef3a7cecf3ce1b/suramiviwudawagikararowa.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/somolivatiwudot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=tor+alternative+androidPDF 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_off0000cd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE537 10100 bytes
SHA-256: cb859177232cc47674d0d814db56bcd8ebfbfa54df71b8736f2040ad45c3fe2c
font_02_sfnt_off0000fbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 18368 bytes
SHA-256: 65d6d24b5ad060d0452ac720c99dabc573811d684328d0baafd8e91239f7336d

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