Malicious PDF — malware analysis report

Static analysis result for SHA-256 b862561ac22e4f3d…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 10:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3926393b59e4965a61ab31c0904dc2bb SHA-1: a7dfef30b71a7ba433f7101b0215fa01a803bac3 SHA-256: b862561ac22e4f3df91c487737fd44a42dbee6b5157badf5dd3de38476e61f34
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable domains, and is flagged by heuristics as a link farm. One high-severity heuristic indicates a link to an algorithmically generated URL, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://jphotographyllc.com/userfiles/file/68073332031.pdf
    • http://zhatuogz.com/uploadfile/file/jivudofigiwemena.pdf
    • https://yourdentist.ro/app/webroot/files/userfiles/files/gutopisojawilar.pdf
    • http://aaas.handyfriendship.com/upload/files/wofakugukijirebozuzitulon.pdf
    • https://nawaasha.org/userfiles/file/xajafe.pdf
    • http://dyglas.com/userData/board/file/15845128546.pdf
    • http://mkpstroitel.ru/upload/files/8667143602.pdf
    • https://theptaynam.vn/upload/files/89178477083.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613566143d2ae---41295813562.pdf
    • https://piti.leaddeehub.com/userfiles/files/62597211095.pdf
    • http://boston.pl/fck_pliki/file/20089407008.pdf
    • http://acecaalcoy.com/userfiles/file/nerixajufegejuzufomet.pdf
    • http://aroma-es.red/yamituki-n/uploads/files/jetepojatojuto.pdf
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/lisuronuz.pdf
    • http://xn--9w3b270a7kf.kr/data/editor/file/30412252369.pdf
    • http://nocleginaplus.pl/uploads/userfiles/files/soges.pdf
    • http://langmypham.com/luutru/files/15893681548.pdf
    • http://ruihuitax.com/files/file/91337225953.pdf
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/xifamezomutide.pdf
    • https://vieclamday.com/userfiles/file/83028983245.pdf
    • http://cafesezony.ru/fck_editor_files/files/wekiwarogefanezerivutala.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138e21a0c33f---36070495460.pdf
    • http://pokrowce-ochronne.pl/Upload/file/pasupulozititudix.pdf
    • http://bienbao.org/uploads/files/29983786344.pdf
    • http://khaskhaan.mn/uploads/userfiles/files/nogixalinag.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+write+a+good+thesis+for+an+essay
    • 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_off0000d9c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C4 16792 bytes
font_01_sfnt_off0000f1d6.bin
8e0b1caea2d4c689b0c6b8c13d7b4b5f02efac4c3bd5b343dc8c16d7947c3d99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 16904 bytes
font_02_sfnt_off00011d27.bin
7be1734c28df4efdfcfd0e397e03a177d58e94b84a24c827a5be589841f6a3ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D27 10776 bytes

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