Malicious PDF — malware analysis report

Static analysis result for SHA-256 45fa6822fedda390…

MALICIOUS

PDF

68.4 KB Created: 2021-10-02 19:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6ed733f1e653a8a006718cd6044a6cd SHA-1: 9522eda14d86930c6e2e88d5900e34c1ec9fa684 SHA-256: 45fa6822fedda390029684647dcfc4318329a55341253ba591ebfab6bb538f37
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, forming a link farm. The PDF structure and heuristic firings suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://areopag-group.ru/sites/default/files/uploads/2234463850.pdf
    • http://manhchenang.vn/webroot/img/files/vufum.pdf
    • http://belloverde.net/emailer/file/96111008042.pdf
    • http://ylpcl.com/ckfinder/userfiles/files/wewodudewupag.pdf
    • http://lica-mpt.it/userfiles/files/51279987338.pdf
    • https://costarica4d.com/contents/files/4825288104.pdf
    • http://hotelbelleepoque.bg/userfiles/file/sojib.pdf
    • http://security-m.jp/tool/images/file/12910384054.pdf
    • http://geasit.it/userfiles/files/33387402128.pdf
    • https://curtain.jinware.com/upload/files/49709752172.pdf
    • http://nitecoreromania.ro/files/file/96387865547.pdf
    • https://branpc.in/ckfinder/userfiles/files/50288365115.pdf
    • http://thibangoto.com/app/webroot/uploads/files/57666018992.pdf
    • http://lagerunda.it/public/upload/file/gopufilexu.pdf
    • https://durgabas.coop.np/ckfinder/userfiles/files/ranesuwori.pdf
    • http://www.sandipmallick.com/fckimages/file/suzalovimaf.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6e503474fa83ca1f6b587c87901fde32/tavatijitunutono.pdf
    • http://sibmaxi.ru/userfiles/file/6523325787.pdf
    • http://quanhoangtsi.com/upload/quangtri/files/1035046500.pdf
    • http://es-iyashinomori.net/yamituki-n/uploads/files/51150172013.pdf
    • https://www.nvsrolko.org/ckfinder/userfiles/files/24786189346.pdf
    • http://nktrading.qa/file/files/7917822964.pdf
    • https://arbormaster.us/uploads/files/65906185210.pdf
    • http://vodova51-53.cz/files/vupekisitasivupenidunis.pdf
    • https://ashleymongolia.mn/uploads/files/sumuwababuxulope.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614b43ae9d4f3---12004060260.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=joint+distribution+definition
    • 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_off0000b0be.bin
24e9fc8458d12ccca8385271cdd2789fbc1233dc5e47eb99e29b2b3c63370198		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BE 10372 bytes
font_01_sfnt_off0000c856.bin
7dc2f84222aec929c018ab73fe910afb05b08a0d2994233068c88317882fd326		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC856 14360 bytes
font_02_sfnt_off0000ebff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFF 16792 bytes

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