Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29e5e1132051262…

MALICIOUS

PDF

78.6 KB Created: 2021-09-13 12:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d3d186291165c4725610fecdd8d5daa4 SHA-1: 8c6976d193d7e1cec636e7b5cc0a28c448621ea3 SHA-256: c29e5e1132051262deb40e7cef4580d10a82dcea702a9721b499cd4bffeaf662
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 for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains a large number of embedded URLs, many pointing to potentially malicious domains, suggesting a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the malicious intent by indicating a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://elger.cz/fckphotos/file/kobedusajedinux.pdf In PDF document text
    • https://serrechevalier-skifun.com/imagesfile/6796995467.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16131079be5245---sisik.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/rolurefexalogize.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/8988667722.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/fadafoxusu.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/61538709466.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/nudesovuxube.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/35830297078.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/28594525135.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/34281184879.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/44025719620.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210904092904.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/velofawonibivuge.pdfIn PDF document text
    • http://blgjad.com/upload/files/79460905291.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/tamozarekorovazugifolora.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/jeritot.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/72808667484.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/59570204475.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/lujijigetezonor.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/xusosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=list+of+social+justice+issues+for+studentsPDF 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_off0000cd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55A 18564 bytes
SHA-256: 496067ff331166e37916b84382dc237364f7a47d50bd4bba3251b5d0001a3f78
font_02_sfnt_off00011481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11481 10656 bytes
SHA-256: 2fa99a4275dbce06a0749262a91881e9858c41179d34f73618a509f504b23be8

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