Malicious PDF — malware analysis report

Static analysis result for SHA-256 d30bc66e9d948ec1…

MALICIOUS

PDF

86.2 KB Created: 2021-09-19 14:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 98d0d0c1e705278f2eb2884609c3e97d SHA-1: e482564e8d18651fe1025524af28d6310c3144ee SHA-256: d30bc66e9d948ec1430407e1d1a255fe9fcdfeaaa43d8cdb5fdf73140295e591
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, indicating it functions as a link farm. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent, likely for phishing or distributing further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nomylo.ru/uplcv?utm_term=skyrim+cave+bear+pelt PDF link annotation
    • http://metabolit-plus.ru/files/file/65498934710.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/zavijijatimexemiduv.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/pizuneveteme.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145cb18f0c27---56006235150.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/titilofosikuzi.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/39566025795.pdfIn PDF document text
    • http://zgic.ru/!upload/files/lagux.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/79758845159.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/41476838663.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/gixizenobedev.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/90407329919.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/40895769069.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/20684548510.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/99100277456.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/64658784052.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/73654965432.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/43106880388.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136a06a1e9d4---1140625538.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/83044899505.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/widafojulikebifovubi.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/27871700910.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/wekukumofetojobuxewu.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/logidekobagutemoteg.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_off0000e20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20B 10632 bytes
SHA-256: 6fe66569e615ee0819cd3c56af7f9fcca953675a8462b0857ecb4b361842b171
font_01_sfnt_off0000fa3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11251 21824 bytes
SHA-256: 2a9e91aa506db0c8751edd2fb7e1e15e32bd96ff1f752f0a7fd36b109e8480b2

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