Malicious PDF — malware analysis report

Static analysis result for SHA-256 2632083e5e18a6c9…

MALICIOUS

PDF

97.1 KB Created: 2021-09-20 02:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0e98b9372f58b40a1602267c86c8f992 SHA-1: cb70fc07eb4ad00f67689e25fa8cbb24d133c8d3 SHA-256: 2632083e5e18a6c95e55b7ef951a16d57186a70a05464bebf4ec4bd7a86beb5b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest the document is designed to redirect users to potentially harmful websites. Although no scripts were explicitly extracted, the PDF format can embed JavaScript, which could be used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5855

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 PDF link annotation
    • http://cachnhietwin.com/luutru/files/falatipajuwulorivewevipi.pdfIn PDF document text
    • http://fitviewer.com/files/file/nuwax.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/pozezedo.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/gowebematofufeg.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/68631490714.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/xikizajuwajupuwas.pdfIn PDF document text
    • http://micruts.org/userfiles/file/sufaxamago.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/63711080441.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/fonuzow.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/kegirijasoxutovomuzezet.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/zibumosu.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/69888189117.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/90620551407.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109071102501236.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/vadosidurowugumafer.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/30313693897.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381591cf2f5---82923111985.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/rezajesufimazofetarow.pdfIn PDF document text
    • http://labotinnghia.com/img/files/zofake.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/vazojurotitawexolupipesu.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/52325391007.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/legofotanerodutesunexan.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5bb8aad19198edad93792518ae828427/18275144506.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E1 10240 bytes
SHA-256: e0f85d3162a9ca6d37748689286f2a6bba43f9d4440a6836d0a7680e19d4b9bd
font_01_sfnt_off00013a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001522a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1522A 17124 bytes
SHA-256: ac26d05a3bbe854199d44cfd8bf03b7ea8316365ae50635d9ea9d3df32e713f6

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