Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e774062d840d402…

MALICIOUS

PDF

73.5 KB Created: 2021-09-16 18:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 04be18d6cc57f0d9a0dc02b462ad8132 SHA-1: 55f71bdaa0e17f3ac38a46a1b9203f844bea04ba SHA-256: 4e774062d840d402be1e662138495e72b20d330389e24bd3fdb08225e8b765b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or link-farming attack pattern. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used for redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://isotope3.pm-ural.com/uploads/files/jedijevokefape.pdf In PDF document text
    • http://kwong-cheong.com/userfiles/74047577159.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/rufudimufinanilavame.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/72353918315.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/jabebab.pdfIn PDF document text
    • https://diphong.com/uploads/23728980100.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/f7ndvcqvkctf2bmbhli7l5qesk/wopor.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/73677571763.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/43868561185.pdfIn PDF document text
    • https://scalper.ir/data/files/file/40336877319.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/taturodagasogomavesapur.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/8536105538.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/sitawagagiwepalaxoduka.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416f123d31d---sajidusolibunididetogi.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-14/20210914152232221408.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/81788135601.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/ditukit.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/rafunikuvemesekavamipejo.pdfIn PDF document text
    • http://agavietnam.com/img/files/92895849941.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/zonudewikamow.pdfIn PDF document text
    • http://hainfelderteich.at/kokadaniz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=dragon+ball+watch+for+freePDF 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_off0000bce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD500 10584 bytes
SHA-256: f14ad51fc8ef2688a8783e8b41741c25dfee8ce291569cf7c932969b47fa5407
font_02_sfnt_off0000ed2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2D 17072 bytes
SHA-256: 7589bb993d624dfa04ef68cdccdbd2b06ef272a5d5dfef7d4195fb7c40b066ab

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