Malicious PDF — malware analysis report

Static analysis result for SHA-256 349dc52bb6053cdf…

MALICIOUS

PDF

68.8 KB Created: 2021-09-30 10:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af37837ff84fdb3904f2a0a5abb0c3c5 SHA-1: 48c4e8974e48bf48696a5f8a659c25773b43a0fe SHA-256: 349dc52bb6053cdf5e112f72152a52c30251d186a5da2bf2d92cf5b40c1df5b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous external domains, many of which are unknown or potentially malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://floramarble.com/uploads/4285409954.pdf In PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/11659428860.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/99881459722.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/67762895581.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/58713604469.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/22494348010.pdfIn PDF document text
    • https://cubic.is/userfiles/file/49748676962.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/77718837542.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/87633134190.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50329581984.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/46056689626.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3febaf3d4---50094420567.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/10800594186.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/92620652679.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/50088931583.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/66568717320.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/54124107127.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210928_889619E451CFEC29.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/gokukibadado.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/rabepisisaxurodafivuj.pdfIn PDF document text
    • http://dajia1.com/upfiles/editor/files/98382438739.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=stunt+car+challenge+3+onlinePDF 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_off0000ab32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC349 10688 bytes
SHA-256: 5b007b5be2cb2a3c8ab34dd28e0cf35b7dd5e097afa8dcdf278ceb5fcbc2e8ad
font_02_sfnt_off0000dbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC7 16268 bytes
SHA-256: 77d6480178d70511ca425d7e90ead79658fce991390bfc5ce14190556f33d79d

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