Malicious PDF — malware analysis report

Static analysis result for SHA-256 dad8d087689a9a79…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 03:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 27c9ffc863c38d4618f2aaaef305a9ac SHA-1: 5b13936837e57b75f4f39d0425e876fbd17c0372 SHA-256: dad8d087689a9a792e2752342c7488801f830d35c7d83937734a81a09f59cce0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=don+quixote+in+english+pdf PDF link annotation
    • http://mikol-styl.cz/userfiles/file/62465912461.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132229591251---temeruxumoloveremo.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/60080992057.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/25638833623.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/widupagamemofiveriw.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/69668441363.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/70983295507.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109140527054542.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/zupobapipofixosudelo.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/88752761952.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/bakukilemikorogebul.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/xuzije.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/zuwevowazapu.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/41207497023.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/40497523983.pdfIn PDF document text
    • http://boldogelet.hu/media/nibosutukapavibuwulen.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/29435305916.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/3625428436.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/38076774018.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/tumekotu.pdfIn PDF document text
    • http://airsoft1.ro/files/file/vuvidivofata.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/fidevagawivutiwusuk.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_off0000d9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DE 17400 bytes
SHA-256: e42f0540f2fafab7256ed7323238f4d7ca37607a98b422cd7162b499d90223f0
font_01_sfnt_off0001061b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E32 10864 bytes
SHA-256: a71a75d25b4e07412827e1239aefd40bb41ff99fa4882d80cc9a583945c053c9

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