Malicious PDF — malware analysis report

Static analysis result for SHA-256 277feb63a40c8a9a…

MALICIOUS

PDF

70.1 KB Created: 2021-09-09 02:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b2c5cb977f6952b4b23c739e5f34ede SHA-1: 9d272fce50a1ef3ee52b93670662cbb5f3da061e SHA-256: 277feb63a40c8a9ae058e0ae214e58a2056f1307ec1bb7d0a2ff8860822167fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting an attempt to obscure malicious destinations or engage in SEO manipulation for phishing. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://sage-chem.com/image/files/20210904_091101.pdf
    • http://levakov132.ru/userfiles/file/farilok.pdf
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/62367615172.pdf
    • https://www.luxboss.com/ckfinder/userfiles/files/62919294105.pdf
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/pasofugujomifolojero.pdf
    • http://mentaplywood.com/images_upload/files/29034283819.pdf
    • http://mebelhotel.ru/images/news/file/zujaxusuva.pdf
    • https://ermolino.mebel18.com/uploads/files/jusukaza.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/6f4812957cf5ed9c8f79d56f5f062b2f/37166765577.pdf
    • https://guclupin.com/calisma2/files/uploads/wipevudu.pdf
    • https://fnb-concepts.com/images/uploads/files/sudofefopap.pdf
    • http://vinhthuanvietnam.com/upload/files/19637824108.pdf
    • http://zjleiou.com/images/upload/File/27079702860.pdf
    • http://elfuklid.cz/foto/Image/file/59829418342.pdf
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22398710411.pdf
    • http://arredamenticucinesiciliane.it/userfiles/files/meragizil.pdf
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/32000832000.pdf
    • http://primaria-ciocirlia.ro/media/file/ratimebosolaxak.pdf
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/39486393739.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=can+you+turn+a+refrigerator+on+its+side
    • 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_off0000b34b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB34B 16792 bytes
font_01_sfnt_off0000cb5d.bin
fe87b8667309b8b3f4a683e27c1c76982644583df95c2e972fef54dc6c6a7ea5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5D 15596 bytes
font_02_sfnt_off0000f2b1.bin
97aaaad9faef54deae2a77866f9dbbeda21b849d49527e1c23be5e9b95bfe4fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 10728 bytes

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