Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21672d90ef75e24…

MALICIOUS

PDF

95.8 KB Created: 2021-09-24 06:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ccac4126376a697e0270302ef10b61a SHA-1: 9d67365e1b8bc386df4d6279244f022dccbf6183 SHA-256: a21672d90ef75e24b5240b7af16dc760125aa2da87f5a397fabc49596e1452a0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities or delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=mulan+ceo+film
    • https://airshow-bg.com/file/6585445026.pdf
    • http://ekhoron21.mn/uploads/files/97608613083.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7ad35cfad---nemojijuguxudalade.pdf
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/boxaguxamelinowogidamel.pdf
    • http://heathrowairporttaxi.website/userfiles/file/82931344637.pdf
    • https://noithathoaphat11.com/upload/files/kebelakaxikaxiputulow.pdf
    • http://mp-journal.com/media/file/56382350364.pdf
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/faxizufawesevuzoripepa.pdf
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/28591553736.pdf
    • http://www.uc-kushiro.net/images/library/File/80679102235.pdf
    • https://calprin.com/ckfinder/userfiles/files/1285786839.pdf
    • http://ourdesign.hk/ckfinder/userfiles/files/rudabuka.pdf
    • https://miaousland.fr/ckfinder/userfiles/files/66518594767.pdf
    • https://uetty.xyz/js/ckfinder/userfiles/files/37297761829.pdf
    • https://funbugs.ie/userfiles/file/65542561554.pdf
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/13678036431.pdf
    • http://ownlines.com/upfiles/file/32224637017.pdf
    • http://candientushinko.com/images/file/5844580628.pdf
    • https://zapcdn.space/web/img/podborky/files/96063214406.pdf
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/80537366887.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/fawusavututisopeb.pdf
    • https://pasationtravellers.com/root/FCKeditor/file/9926569386.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3d4.bin
03e2aa267af4f6bcecbb114c12091959efb5a4ff4146608b1e06f3493a4fa6da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D4 10224 bytes
font_01_sfnt_off00010ab0.bin
0a7c40006fc27d51153b21d6a48ea79a8c7f146cc8b15030b343ea684e52a4c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB0 16416 bytes
font_02_sfnt_off0001216a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1216A 16792 bytes
font_03_sfnt_off0001397c.bin
98e63df8b158941433f749bdbecabb2960d755628d717998d871c86514595081		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1397C 21096 bytes

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