Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17b33e5b622f458…

MALICIOUS

PDF

89.4 KB Created: 2021-09-16 10:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3931f142bc40cd04dc429eae81887d63 SHA-1: 1be7a845c461edf4aee38cc4221d2ee9cba88351 SHA-256: d17b33e5b622f4584f67745fa2c1b09c13b3c1f5ab63cd01153028b14efe44e8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs pointing to disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to obfuscate the malicious links or perform further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://ketchas.ru/uplcv?utm_term=magisk+root+android PDF link annotation
    • http://canigrup.com/userfiles/file/ruvukumepimotujiderifu.pdfIn PDF document text
    • http://airmon.hu/images/files/laledodevezop.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021091018234438.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210912_4AB77714C0819C4B.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/tikilabigodotulepob.pdfIn PDF document text
    • http://gysanya.com/upload/file/210907203014948655zcsuonhlboul.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/40106322167.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613D43A8AAACC.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/27540529541.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/wetutokirivajex.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/45811841911.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/82101530106.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/16234663894.pdfIn PDF document text
    • http://gnox.vn/upload/files/83466409545.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/60828571548.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139b4dbddf0e---doxoxibagej.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/fapikab.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/48821084700.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/86548074709.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/gabirerifoduwena.pdfIn PDF document text
    • http://kebirbeton.com/userfiles/file/zagewowiwuvorum.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/82659132888.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86B 23220 bytes
SHA-256: aeccfd9030283d23b185359f2992801b279c9cf401bd81e7f64e35215d4a34d8
font_01_sfnt_off000112fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FB 10328 bytes
SHA-256: d9587c45c1ea8a5fa350d7353c8195b544ef2f96ffe6b8fee17ec9159b278a1b
font_02_sfnt_off00012a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A32 16060 bytes
SHA-256: 64af0185a2beffa7382febdf957b2ddd2015d3985e5bc97cf8ad64f3c2914973
font_03_sfnt_off00013f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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