Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf89b91fc65eb5e…

MALICIOUS

PDF

99.4 KB Created: 2021-09-20 02:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d50d71aa9777e4e5ef89d37cb97b593e SHA-1: 4f79ba64466dc6ffc34d219d31142224b77cc8de SHA-256: 6bf89b91fc65eb5e14478ec32c120c15b7c90b0dfa1f22d4ce4a8cd08454de1d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs and is described as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://oniceh.ru/uplcv?utm_term=slug+it+out+1+apk
    • http://cachnhietwin.com/luutru/files/falatipajuwulorivewevipi.pdf
    • http://fitviewer.com/files/file/nuwax.pdf
    • https://healthmatters.me/userfiles/file/pozezedo.pdf
    • http://xn--b1akwe.xn--p1ai/userfiles/file/gowebematofufeg.pdf
    • http://movietek.vn/hinh-anh/files/68631490714.pdf
    • https://gastrotest.co/ckfinder/userfiles/files/xikizajuwajupuwas.pdf
    • http://micruts.org/userfiles/file/sufaxamago.pdf
    • http://reafamily.lt/ckfinder/userfiles/files/63711080441.pdf
    • http://www.mariabeckmann.com/fotos/uploads/files/fonuzow.pdf
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/kegirijasoxutovomuzezet.pdf
    • http://qazaqbanki.kz/data/content/files/zibumosu.pdf
    • https://namkhoasaigon.vn/web/images/files/69888189117.pdf
    • http://mprime.net/ckfinder/userfiles/files/90620551407.pdf
    • https://hearing-outlet.com/uploads/files/202109071102501236.pdf
    • http://espaciocultivarte.com/ckfinder/userfiles/files/vadosidurowugumafer.pdf
    • https://eravukappalpalli.com/userfiles/file/30313693897.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381591cf2f5---82923111985.pdf
    • http://espacioschillout.es/images/admin/file/rezajesufimazofetarow.pdf
    • http://labotinnghia.com/img/files/zofake.pdf
    • http://accessprecision.com/userfiles/file/vazojurotitawexolupipesu.pdf
    • http://canyonmeadows.org/userimages/52325391007.pdf
    • http://citygclub.com/ckupload/files/legofotanerodutesunexan.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5bb8aad19198edad93792518ae828427/18275144506.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_off000122e1.bin
e0f85d3162a9ca6d37748689286f2a6bba43f9d4440a6836d0a7680e19d4b9bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122E1 10240 bytes
font_01_sfnt_off00013a18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A18 16792 bytes
font_02_sfnt_off0001522a.bin
ac26d05a3bbe854199d44cfd8bf03b7ea8316365ae50635d9ea9d3df32e713f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1522A 17124 bytes

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