Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a82f251a0c0a1d…

MALICIOUS

PDF

69.1 KB Created: 2021-09-13 17:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c47397219fe01ef278cb1ac3b5540d0f SHA-1: 418ba2a2ded3bedf06a50a1b4cb761bfccb9c41c SHA-256: 23a82f251a0c0a1d845867574d2206f7c436d9acbc2c6f7ca8120993b5bc364c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrive.ru/uplcv?utm_term=diablo+android+game+download PDF link annotation
    • https://endobible.com/userfiles/file/17497122775.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210905_060832.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210913024648.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/bumotefaxenubuwusagun.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/tozonexifuwopafasor.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/rusonudev.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/68249962917.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/lused.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/672525726.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/88149816161.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/f6uuvf9uenosnbr56vmi67haqu/51390690922.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/72554795217.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/jekuwapo.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc6913bc5d---36205852517.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/91548168644.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/zapexerubumonotusodafugul.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/pevesavawukumadakurazun.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/zukojaw.pdfIn PDF document text
    • http://7profi.net/userfiles/file/78946861789.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/patomodirojuxelifogapafa.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/89353862206.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/67741516111.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/57822054156.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_off0000b24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5F 14800 bytes
SHA-256: 12778c63501dcb3b95602d0f9bcb255884d35b8d942cccbc9407c3b634cfa9ce
font_02_sfnt_off0000ef8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8B 10552 bytes
SHA-256: a437e6ee88ea66630de5f67b8ef3f2b63c8bd488809a09fbeda59b4c005ca7c4

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