Malicious PDF — malware analysis report

Static analysis result for SHA-256 b173a288906c0681…

MALICIOUS

PDF

79.8 KB Created: 2021-09-23 20:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 641ee904b3e706c90e2b23af0462d06d SHA-1: 25223661a918cce73d43db1e9f984c2c268f0e58 SHA-256: b173a288906c068158aef08f36a37e0528f2d7df097644f345eaac5d441761e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to unknown PDF files on suspicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of links on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.sczct.com/up_files/file/23665963143.pdf
    • http://p-jtech.com/userData/board/file/95732626744.pdf
    • https://rajaunited.com/contents/files/wujexeso.pdf
    • https://sukienmiennam.com/userupload/files/70681495765.pdf
    • https://igraonica.me/userfiles/file/46648617050.pdf
    • https://pasationtravellers.com/root/FCKeditor/file/71808873388.pdf
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/bolefix.pdf
    • http://finpacecuador.com/userfiles/file/91229885738.pdf
    • http://hoachathoanggia.com/userfiles/file/90868131154.pdf
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/31309219136.pdf
    • http://gibkrakow.pl/uploads/files/16509757640.pdf
    • http://ajarnveerapong.com/UserFiles/file/vodevaxozude.pdf
    • https://aznamaste.com/ckfinder/userfiles/files/60163760475.pdf
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/61137776720.pdf
    • http://7seapharmtech.com/Uploadfiles/files/dakatibuw.pdf
    • http://www.salac.cz/ckfinder/userfiles/files/gizekuwepivanubujapam.pdf
    • http://yossy.biz/userfiles/file/livotekijuzutanazipufi.pdf
    • https://produse-zilan.ro/files/61965566281.pdf
    • https://pyccenter.com/images/Upload/file/40674080096.pdf
    • https://fundoohairstyles.com/hairstyler/images/file/54780870582.pdf
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/77212314247.pdf
    • https://dom4m.com/userfiles/files/wabomopexokirevuk.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/54547907776.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=car+themes+for+android+free+download
    • 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_off0000cf83.bin
a554ca84282030605fc3dd0865b080a5c83de3eb346e7a751d74abe95f11e9b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF83 18812 bytes
font_01_sfnt_off000100d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100D8 16792 bytes
font_02_sfnt_off000118ef.bin
ca2b5f73ed5b65397bedd4ae7e3cd5fc5ac733b8fcff2113292d570385f146f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118EF 10736 bytes

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