Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b01b2d78c638ad…

MALICIOUS

PDF

68.4 KB Created: 2021-09-30 23:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bccba0c32e04672b33a8140eeef36d1c SHA-1: d1e41939f8eb88b1a454b01e04eda584dc80abc6 SHA-256: b4b01b2d78c638ad3a779288f05d8c7da61a20528cd60eac12da2fe6cda099bf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, indicating an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=sonic+the+hedgehog+for+android
    • http://polkovnik.su/upload/file/85026035823.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/xogivupikajijelomavimolin.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/q4kfcpr7sdq01d4bfksv07o8t0/33424538112.pdf
    • http://tk-weld.com/images/library/File/xalas.pdf
    • http://abwingsjanaf.com/uploads/files/22684521656.pdf
    • https://lbk-ingatlan.hu/uploads/file/fivuxulamusobaboroxutem.pdf
    • https://suprizpin.com/calisma2/files/uploads/xajatazatejarud.pdf
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nugaxowanadovejepi.pdf
    • https://jecoexports.com/ckfinder/userfiles/files/jixikosonerulisaxojotovi.pdf
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/fumewejupowiwawox.pdf
    • http://concilianavarra.com/userfiles/files/34168531193.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/gqda8il6b0ol6ep73paf581377/fazofovixe.pdf
    • http://detskaoptika.cz/ckfinder/userfiles/files/refegulal.pdf
    • http://onthebroadway.com/CPD/adminpanel/upload/file/lufuroj.pdf
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/fedekadurewudapipidixok.pdf
    • http://nirmalamathachurch.org/cms_uploads/image/file/gizarakiwuwero.pdf
    • https://wtmasonry.com/ckfinder/userfiles/files/65446336977.pdf
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/27013206707.pdf
    • http://onlinetradeshow.ir/uploads/files/87804467969.pdf
    • http://shepardinteriordesign.com/rw/upload/file/nubojozavaxa.pdf
    • http://mya1fc.com/files/ckuploads/files/zevolovokesaposakebak.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000acd5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACD5 16792 bytes
font_01_sfnt_off0000c4e7.bin
919e9616c36f8e491e96f09450e9009d50c88ddad844eb47109ce151c9cb8c54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E7 15768 bytes
font_02_sfnt_off0000ec96.bin
e7ff92578ed85ebd591ff0df70fc3aaf78100d4d7358170a2d2fc96bff66af55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 10616 bytes

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