Malicious PDF — malware analysis report

Static analysis result for SHA-256 48248cc40a4d6e05…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 03:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b42e7eb7c30823faaf194bde928243a SHA-1: 3bee4a30c32a4ec57cf540de8b3e4d99751026c5 SHA-256: 48248cc40a4d6e05f825fcc6b30ad925056aa942f3baf5ae97ed46ecd67fd579
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs and is structured as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://smidgel.ru/uplcv?utm_term=fifa+game+app+download PDF link annotation
    • https://xeroxexpres.cz/userfiles/file/nukeseredawisilop.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/47592128967.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/lomotelavifenakironedekav.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/towevozakepinuzepibe.pdfIn PDF document text
    • http://fittbikese.hu/files/file/nemavuwuzuvonixezozuwetiv.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/21328258663.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/76018702190.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/didiporodosemaredopuz.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/9916488022.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/28977342824.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/sujumotodosufaw.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/sejenizafafugu.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/49923721996.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613415f142988---pakejarupapagobeder.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/jorufewigufuxefuxoluraroz.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/zifanol.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/d683ca97ed12faffe4ee69de36953119/19450475194.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/11994072506.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/39996134903.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_off0000db8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8B 10536 bytes
SHA-256: 010a94f6022f0cb5d871f1d73b2b6af3966a1483247ffcabc31717bfd606b871
font_01_sfnt_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B60 18068 bytes
SHA-256: 148ece9a96d1d4ff2f71f998bcce4add9ae872ee0e03769096bbf00899ce5a33

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