Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc62de27d30b2178…

MALICIOUS

PDF

89.7 KB Created: 2021-09-24 05:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a722c17d4ee6b423964b18cf09ac0e0a SHA-1: 2c9868260148a0839c2dee60c4df66a2c792c74f SHA-256: cc62de27d30b2178b1bce73b9e71f552b0bd319e273fd6839e55b60d4e41efd6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links to other PDF files hosted on a variety of domains, many of which appear to be disposable or low-reputation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the nature of the links as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=applying+elliott+wave+from+theory+to+reality+pdf
    • http://ros-grad.ru/fck_editor_files/files/ramelezitegojepokeli.pdf
    • https://grdr.org/paidel/ckfinder/userfiles/files/nesilinu.pdf
    • http://doctour.hu/uploads/ckfinder/userfiles/files/27698483160.pdf
    • http://cdkuysuujk.handysociality.com/upload/files/67295516750.pdf
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/nabaledojegorekad.pdf
    • https://mimpidia2.com/contents/files/23488125939.pdf
    • http://trinitysportsandleisure.ie/userfiles/file/rutat.pdf
    • http://pincailight.com/zk/UploadFile/file/2021090309584073499.pdf
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/fetav.pdf
    • http://transcash.com/ci/userfiles/files/39020412895.pdf
    • http://exmar.it/foto_fck/file/jenovamadofofesi.pdf
    • https://ahreco.com/uploads/news_file/wobifogepumiwexagisenar.pdf
    • http://fitviewer.info/files/file/95539510538.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/50c4b081719e740be4fab368a21077b5/zunetotosasiwujebu.pdf
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/86153283564.pdf
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/xopuponekusajubinotageril.pdf
    • http://thepokeluau.com/uploads/files/16278357721.pdf
    • http://phuongsen.com/img-chamthi/files/zovusorekirorulotezurarov.pdf
    • https://profipreklady.cz/www/ckfinder/userfiles/files/76562905888.pdf
    • http://thestarbusan.com/FileData/ckfinder/files/20210902_4EB1E1D352E0019A.pdf
    • http://akcjonariusz.com/UserFiles/file/954297422.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/26c3f42a6d9b4f24301e5f11198de8c6/fikilorukidis.pdf
    • 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_off0000f994.bin
73727cf3a15adcec0d9b42c94eb19a4b0d016b7f5f39b6092712c55242d77c05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF994 11024 bytes
font_01_sfnt_off000112e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112E6 16792 bytes
font_02_sfnt_off00012af8.bin
d6eb7d6e48bda399939456127659e771bc862b389b882d15e8dd20f88f8f2884		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF8 17716 bytes

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