Malicious PDF — malware analysis report

Static analysis result for SHA-256 a145c65606f5c775…

MALICIOUS

PDF

88.4 KB Created: 2021-09-14 08:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c7908b851918651527e4fc738cea7d48 SHA-1: 0794b96a044db4283734c50ac1ccc0c1105da882 SHA-256: a145c65606f5c775450d9935d5d142f4a8d9d57245b5bc6e4b3e6797ec23f55c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://inwebjor.ru/uplcv?utm_term=new+tamil+movies+2020+online+watch PDF link annotation
    • http://electrogalicia.com/electrogalicia/recursos/archivos/46543237905.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/15916058767.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/94913880610.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/93311755853.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/miwewutobajubasa.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109131323441374.pdfIn PDF document text
    • http://wdnederland.nl/file/gemiwar.pdfIn PDF document text
    • http://dentali.cz/files/files/jizix.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/37736431634.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/41368212910.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/zisusufokakogafapa.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/76383682492.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb15bb9c4d---72707209915.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/6717085278.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/82994719354.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/julitudi.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/bikodepavon.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/31216603473.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/gazet.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/dogixapokawit.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/zexunalosifamamugis.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/57395737920.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/babuvulekapu.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/vobatobezobon.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/nelimebixe.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_off0000f637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 10768 bytes
SHA-256: 12696eef78741734e87d6b3878cab51a68f2364b69b8484e265c8443fd5c9cef
font_01_sfnt_off00010ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE9 17520 bytes
SHA-256: 01b34637b6791d26cdc1eacae40a3f289c58a7dc3d6c783723d166eb9d248a74
font_02_sfnt_off00013be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1