Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6511b7ab49dcd5…

MALICIOUS

PDF

84.0 KB Created: 2021-09-20 17:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 91c7dcb02129715403ab27f7843005bd SHA-1: 6aced334a11f071f1fa846b4913b058b65504ab3 SHA-256: 4f6511b7ab49dcd510a87b5f42cf3c1d933e77d079923d023aa3ac526655ae8d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://allytemp.ru/uplcv?utm_term=modal+verb+would+examples PDF link annotation
    • https://presstone.hu/userfiles/file/jutobodova.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/96498275013.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/fozunafotenabuxufan.pdfIn PDF document text
    • https://melz-feu.ru/upload/91024539016.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/16925286201.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/kusorimaxamuwa.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/98131416600.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/96440315169.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142feee7e064---fojujoretexepod.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/woxawiwixotu.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/todavimegibodapugulebi.pdfIn PDF document text
    • http://rurisnet.org/images/file/93093382598.pdfIn PDF document text
    • http://xprchemical.com/upload/files/wanogalinobimoxosijipadi.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/xemorekirazatowosi.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/rerag.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/gitibugemerekakidiwej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b3fc02587---75418332643.pdfIn PDF document text
    • https://dyaa.club/uploads/file/jonetupeza.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/wugiburitanutimagawoj.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/kunudobivi.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/tugejozen.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/54115809362.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/72667407754.pdfIn PDF document text
    • 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_off0000e07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07D 19032 bytes
SHA-256: caeddf75642072404b24f31fa435ae97d24c798bd67e2aa21949fe737c5097f1
font_01_sfnt_off000111db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F2 10744 bytes
SHA-256: 3ae15f21edf87b274f0ed2ec9de218cba3018143bc013f95b480ce1ad85366b6

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