Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ae1010e451676a…

MALICIOUS

PDF

82.7 KB Created: 2021-09-10 04:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e45e46cd4b1a0c6f64c217d71fb85c6e SHA-1: 5ef0504a54c71e823c5a6e7ae89f3c08632ae047 SHA-256: a1ae1010e451676ab5d443a16c73c284a527dec62a35c3949f3706ca8b308e65
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards exploitation or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • 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.
  • 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://philabc.ru/uplcv?utm_term=when+did+the+new+season+of+the+walking+dead+start
    • http://copingconversations.com/userfiles/file/kibepapu.pdf
    • http://el-system.jp/uploads/2012/files/linojafolovupivadiwavewen.pdf
    • http://ildungrice.com/fileupload/fckeditor/file/86374442621.pdf
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/rofiwefezaweb.pdf
    • http://tabouligrill.com/ckfinder/userfiles/files/vudonij.pdf
    • http://aedjtjdshbf.pretty-match.com/upload/files/38281298259.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa81aeb1a7---85605433677.pdf
    • http://ort168.com/upload/ckeditor/files/31100459969.pdf
    • http://jessie.vn/images/ckeditor/files/2056887950.pdf
    • https://ahl2005.com/ckfinder/userfiles/files/44937627379.pdf
    • http://yourbuilding.ru/userfiles/files/52063575117.pdf
    • https://bitree.com/ckfinder/userfiles/files/39892779752.pdf
    • https://ceccarmaramures.ro/userfiles/file/togesanimazigupavidegefo.pdf
    • https://ghnservizi.com/file/tepapemume.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/io95dblkkke1h08ul0qcblnofv/2940833134.pdf
    • http://rpsbchamber.org/editorData/file/mutimasifowubefeviveli.pdf
    • http://generoussecurity.com/uploads/dugezusalixateg.pdf
    • http://fratellibeninca.com/images/file/goxumexukoxuzef.pdf
    • http://ain.proximeo.com/ckfinder/userfiles/files/60755722781.pdf
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/topifibo.pdf
    • https://mclandpin.com/calisma2/files/uploads/84056410634.pdf
    • http://sea-cruise.ru/ckfinder/userfiles/files/17863080107.pdf
    • http://www.donboscovizag.org/images/files/34274697512.pdf
    • http://xn--9w3b270a7kf.kr/data/editor/file/20903517167.pdf
    • http://floridare.ru/app/webroot/img/uploads/file/394305_53227951436.pdf
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/76700788205.pdf
    • https://sfeerweter.nl/userfiles/files/73203211207.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_off0000dc60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC60 16792 bytes
font_01_sfnt_off0000f477.bin
db3d7ebf7b69e063ec7fd07a9e365a35dfe1f6bc7eef747d9df1178d307347dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF477 10804 bytes
font_02_sfnt_off00010d29.bin
4a4a894deeafdfe37524c231a09ea5f4fdad071d04866ed2044c3317f156415d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D29 18236 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.