Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ef9296d66c0da9…

MALICIOUS

PDF

74.1 KB Created: 2021-09-19 04:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5955a7e9d8ac62f43dd7e1ad9860524a SHA-1: 0fc378f50db88c21c12f9d448206a46b0f9fda23 SHA-256: c5ef9296d66c0da9fad7349b1d7be0c586be6dd1626091b209e5b8ffdf914be5
154 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains or point to IP addresses. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://synerhu.ru/uplcv?utm_term=run+android+apps+on+surface+rt
    • https://cplastik.com/data/cms/file/15581926577.pdf
    • http://chono.mn/uploads/userfiles/files/salosovuvowefogosalam.pdf
    • https://www.nitdgp.ac.in/uploads/userfiles/files/55723766238.pdf
    • http://185.33.116.145/~acus01/upload/files/50214938691.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/63f89d1eb8304ac6c80cb9edc8761161/tomunililedubonil.pdf
    • https://nstyapi.com/resimler/files/vamuwikejafinukofakun.pdf
    • http://mackyz7automotive.com/js/upload/files/69106356644.pdf
    • http://karpatskiles.ru/store/file/69433828615.pdf
    • http://myshopgroup.com/userfiles/files/zisutimudufegitolufo.pdf
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23521964079.pdf
    • http://goddesshair.net/upload/users/files/ririvetedisoruzerotilet.pdf
    • http://longvu.vn/Images_upload/files/norikurivuvetanejaju.pdf
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/lonamip.pdf
    • https://kingdomdatesuae.com/userfiles/files/zaxobofefepusazimu.pdf
    • http://cochemical.com/upload/files/kuneperobopagabujisa.pdf
    • http://www.firengo.com/userfiles/files/41157950656.pdf
    • https://weboonline.com/ckfinder/userfiles/files/gidepulapo.pdf
    • http://www.egavilanes.com/ckfinder/userfiles/files/7345391175.pdf
    • https://artcorner-fiberglass.com/userfiles/files/texudijokapag.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/089ce144b5f194e58e641fed830b3c4d/zofex.pdf
    • http://inica.org/files/file///tilanujevoxe.pdf
    • http://atya.eu/files/file/rapumilowevepiwulebo.pdf
    • https://padservhosting.com/userfiles/file/61096631751.pdf
    • http://wellgroup.cz/UserFiles/File/20522415717.pdf
    • 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_off0000bf10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF10 16792 bytes
font_01_sfnt_off0000d722.bin
4af88d7aa3df16eaec279c2abbb2ecf0da262510379b399139bebb0dc48b2ced		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD722 16488 bytes
font_02_sfnt_off000101ca.bin
79106c6d5adf6034583c1b891c955d2286f776cd5a1b7ce8f404648fbd03a407		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101CA 10712 bytes

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