Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5a9ddca866936c…

MALICIOUS

PDF

91.7 KB Created: 2021-09-15 09:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8562580ca426b09b77ab0f0c5f277c49 SHA-1: f745c5bac95b16b7af5ddfb761b00f9bff1365cb SHA-256: fb5a9ddca866936cc9d370a76a655803768c3eb6d262872d3c6262cfe3e35399
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://355353.ru/userfiles/file/95809995664.pdf In PDF document text
    • https://tonwen.org/userfiles/file/daretemilepima.pdfIn PDF document text
    • http://ativn.com/upload/file/xikudatawurerig.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/memijijepamikudof.pdfIn PDF document text
    • http://hibertek.com/image/files/20210912_184748.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/lokizaxanoba.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/bidelomaxasezevap.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/62057713372.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/2556715856.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136511925119---86930468009.pdfIn PDF document text
    • http://vucert.vn/uploads/files/3805669001.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210908163229.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/jirozuxejufazitejo.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-7/20210907222405870575.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/jararuwabojole.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/53961433419.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/mawoso.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/sajoken.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/jixekazikovoki.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/47392344525.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109031444334066.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/36053678602.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/70868232995.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/98713704593.pdfIn PDF document text
    • http://sakem.org/userfiles/files/wofevenuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=hag+seed+margaret+atwood+pdfPDF 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_off0001012d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001193f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193F 18424 bytes
SHA-256: eb6d88aeec9f37c412b97ccf3362f76b645b243fe8fb30d3e0a880bf3d65a4b2
font_02_sfnt_off0001490b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1490B 10676 bytes
SHA-256: b9b60c61fc17e76b9ba0c134ffcdad6b83d9e7105d529752c3db6a4d2e2c59cd

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