Malicious PDF — malware analysis report

Static analysis result for SHA-256 672328d291033158…

MALICIOUS

PDF

74.5 KB Created: 2021-09-16 12:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82800ad2a9f602e0299d0d9dc6ad9b77 SHA-1: 1f4baae501be6f446309a5526c2ec3f705bd02a9 SHA-256: 672328d29103315899529ca0717d8a6a60ccc3ab282c3dd1385a83dfade23a8f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript which is likely responsible for redirecting the user to a large number of external URLs. These URLs host other PDF files, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vucert.vn/uploads/files/35864929145.pdf
    • http://vidiniaibreketai.lt/userfiles/file/revavuj.pdf
    • http://globalsublimation.net/uploadfile/files/56119766085.pdf
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/74347271997.pdf
    • http://mundori.com/js/ckfinder/userfiles/files/kitizaxabexuxi.pdf
    • http://cioccolatogallucci.it/userfiles/file/falesizupojudanugupututi.pdf
    • http://nationshield.ae/userfiles/files/kumexepowalafona.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161363ff316575---38528353426.pdf
    • https://sergiomauri.com/images/file/gixasazavovinudijelir.pdf
    • http://ukrfirework.com/images/file/ligigaje.pdf
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/17897741596.pdf
    • http://eltdb.com/UserFiles/files/ropoxinujugavobov.pdf
    • https://daiichitravel.com/uploads/news_file/paruvix.pdf
    • http://modernplating.com/userfiles/file/kitawudarewipedututonod.pdf
    • http://gniortho.com/files/Upload/file/jenorefetedefes.pdf
    • https://shen-su.eu/gfx/userfiles/files/xepifusorazepasozovosiber.pdf
    • https://kp-bs.ru/upload/files/36271993091.pdf
    • http://kurumakaitori-one.com/js/upload/files/vajojitimavewafapofazuxi.pdf
    • https://sportcity.bg/webroot/img/content/files/83023846978.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=inter+1st+year+maths+1a+textbook+pdf+english+medium
    • 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_off0000b8c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C8 16792 bytes
font_01_sfnt_off0000d0da.bin
3cbea57355de4f18bc091bbf3ceb1abdb112d9a14857312fb01c89c05e636405		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DA 18464 bytes
font_02_sfnt_off00010164.bin
1d4000de9dcb02db1feb75908b58c9922f8f6797cd421993d368e2e555f0c63c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10164 11496 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.