Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5738fa19bd27f8f…

MALICIOUS

PDF

88.2 KB Created: 2021-09-20 16:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ec83dcf1e12453e0ede234085a8e96e SHA-1: 2dc533db3a530a005af6d0d908226292b84ce43b SHA-256: e5738fa19bd27f8f33fabb78faf1f08bea5dbf3d9d2399029c78426e7f3ea071
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, suggesting it may execute malicious code or redirect users to external sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links to disposable hosts, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cachnhietwin.com/luutru/files/40678541224.pdf
    • http://capesociety.ca/uploads/files/65645953644.pdf
    • http://denda.co.kr/ckfinder/userfiles/files/46708192518.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413dbdcdbe1---pubilewulibux.pdf
    • https://thaiwoodengames.com/files/upload/files/7432246305.pdf
    • https://kolkataangikar.org/ckfinder/userfiles/files/58011273832.pdf
    • http://gardensyellowcab.com/admin/images/file/7276985691.pdf
    • https://airbays.com/userfiles/file/rerisu.pdf
    • https://vmwarts.com/ecovic/file/88363042298.pdf
    • http://bishnutoursandtravels.in/userfiles/file/xonotifajawizovofu.pdf
    • https://szelvedojavitasmiskolc.hu/files/files/kaxunet.pdf
    • http://normel.org/files/upload/file/zidupikabivakugakusalo.pdf
    • https://birgatour.mn/js/ckfinder/userfiles/files/70376296534.pdf
    • http://noithatmfc.com/media/ftp/file/tugojadafen.pdf
    • http://sweepinstyle.com/userfiles/file/86570276018.pdf
    • https://yourdentist.ro/app/webroot/files/userfiles/files/terituxenewazererugewi.pdf
    • http://sportsclinicwest.ie/media/contents/file/niwizuvuxi.pdf
    • http://orzo.cz/uploaded/files/75184404495.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/e768051aa7ae8cf9a1b415d1236f87ac/60603736315.pdf
    • http://casms.org/atts/news-files/file/wafemuj.pdf
    • http://controldellaves.com/app/webroot/arxius/file/96520552158.pdf
    • http://appinaris.net/ckfinder/userfiles/publics/files/99022026203.pdf
    • http://restravel.ru/ckfinder/userfiles/files/lesezipuvakekadobisikat.pdf
    • http://ya-ke.cn/admin/upload/fejenufegawulewozox.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=fate+grand+order+en+apk
    • 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_off0000ec0b.bin
010307485b0635c69c508596a459e0d2d6a8f99e9c8dc4f0a93a7c8c239abd87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 20696 bytes
font_01_sfnt_off00012248.bin
5b54b49e02ae6624d0a1973d552ae554a660b2307aecc434d54ccf8e4bccca6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12248 10328 bytes
font_02_sfnt_off0001397a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1397A 16792 bytes

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