Malicious PDF — malware analysis report

Static analysis result for SHA-256 107debb9ae4495ae…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 04:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5fd03fe2882e76575c98f470cbddb12b SHA-1: 1df792d72da75131ca4461879fc87926017bdc2b SHA-256: 107debb9ae4495aef3a4b5ee94663bd093969ba6f23a3016dc2b9771286d56cd
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 and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to PDF files on various domains, suggests a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://mt-creativestudio.com/ckfinder/userfiles/files/vekojafalokakivovudirude.pdf
    • http://headlinesdinerla.com/uploads/files/78533954144.pdf
    • https://gencerenerji.com/resimler/files/nijekevuxaje.pdf
    • https://coffotea.com/uploads/files/202109091219377148.pdf
    • http://synhbio.com/upload/files/97700118761.pdf
    • https://carsen.sk/editor_uploads/system/files/80496530637.pdf
    • http://dream-mebel.com/pic/file/36101882509.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d16252a80d880ffdc53387500d2631d/72338442591.pdf
    • https://hoalavender.net/upload/files/widarexipelurixub.pdf
    • http://robedecreateur.com/img/files/64208006802.pdf
    • http://adimhukuk.com/resimler/files/doditadesogix.pdf
    • https://estoniapools.com/contents/files/nosapozexuwoxopuponono.pdf
    • http://ovecollection.com/royal/admin/images/products/file/5483747237.pdf
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/pukisi.pdf
    • http://tavaszitura.eu/userfiles/files/68451486500.pdf
    • https://kolegium.inaheart.org/upload/files/nofizagovaj.pdf
    • http://orenprom.com/img/account/file/19247019310.pdf
    • http://studioingegneriavaragnolo.com/userfiles/files/kifuvabiganisakakuros.pdf
    • http://files.ibiza-ferien.de/file/94605936416.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134861a95835---ruvanava.pdf
    • http://xetaihyundai.net/upload/files/wagugepudu.pdf
    • http://gonvvama.net/filespath/files/20210910010003.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=grabar+notas+de+voz+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dda8.bin
2c412c172770885efcbdeb82572ecb7759da925a2f68205e6b860b2a7f24146f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA8 19004 bytes
font_01_sfnt_off00010e4f.bin
1bd6b54ad890596d72a468df33f5d4c86b8ab02727b6b5843f213fa346152094		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4F 10500 bytes
font_02_sfnt_off0001266e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1266E 16792 bytes

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