Malicious PDF — malware analysis report

Static analysis result for SHA-256 65844e6f917e824c…

MALICIOUS

PDF

82.1 KB Created: 2021-09-10 14:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3f5bc8d82e60c8206e298987826c4ccd SHA-1: 4b97a6e5ba538616bd30862c86d32e5bb301c94f SHA-256: 65844e6f917e824cd2a0f3c090c52f4f14ecd3845517110a61574635dfa839a6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The document also features a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://farmaciafici.com/userfiles/files/noderi.pdf In PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/laximujav.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-8/20210908001347203008.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312d50d3f6b---xiwifagu.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/49972761537.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/zidojarijifilogalegowez.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/10718955237.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/70070327752.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/91403280536.pdfIn PDF document text
    • http://gewald.ru/content/Files/vapavisasutugeloroj.pdfIn PDF document text
    • https://aneri12.cz/res/file/76392583064.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/56534867294.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/loxilefumesibepimovuwu.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/8017560740.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/xenesulakitiz.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/bumudaxoparazilawepas.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/10999320569.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/50801626188.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/56568139675.pdfIn PDF document text
    • http://air-con.ru/upload/files/pukugo.pdfIn PDF document text
    • http://nhatnguyen.vn/media/ftp/file/vawokikitanigavepagewepid.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132f04864ce1---gixuwak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=eskom+se+push+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 10252 bytes
SHA-256: 47763faef658495626d95a407b8513fdfdcca36f23fe644f32da542b8c89c64f
font_01_sfnt_off0000f1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CB 18788 bytes
SHA-256: 7d9a525a8277941ab4e36b29fc45db87816a3e34648ba28b8c865bbc9b329215

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