Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df6e0582ea6ce5b…

MALICIOUS

PDF

74.0 KB Created: 2021-09-27 06:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c49c2d5b7bfac1ef28171bbbdf158430 SHA-1: 9e2fea188ff31f57bc72e6fa7c57e902f0cc623a SHA-256: 8df6e0582ea6ce5b5397441d8799d88cf097678a150b05dbc2ab461a25fcb6c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to other PDF files on disposable domains, suggesting a link farm or phishing campaign. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

Heuristics 5

  • 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.
  • 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 http://ibb-online.ru/f/file/zodabotave.pdf
    • http://3e-recycling.ru/app/webroot/filesfiles/vunofejunokipekepukovabag.pdf
    • http://ccshecea.org/upload/files/gopixizugezuwazege.pdf
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/63671975350.pdf
    • https://taucaotoccatba.vn/images/news/files/bazenoga.pdf
    • https://nmg.lv/img/uploads/files/687186806.pdf
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/44908099735.pdf
    • https://wickedcheesy.com/images/file/67719021669.pdf
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/zexiz.pdf
    • https://ltssinternational.com/res/wysiwyg/file/wisosejojizinexojumi.pdf
    • http://fashionflutters.com/ckfinder/userfiles/files/dilatosesom.pdf
    • https://camgloberealtor.com/userfiles/file/33898623997.pdf
    • http://packamate.com/userfiles/72254070560.pdf
    • http://lenosada.sk/editor_uploads/files/waxogerukadowawunuji.pdf
    • https://smobiil.eu/userfiles/files/zejunasoxipiku.pdf
    • https://usssecuritate.ro/userfiles/file/dumededavulanutofupilefi.pdf
    • https://chezgregoire.fr/userfiles/31728378891.pdf
    • http://beautifulmoda.com/userfiles/files/tisuzomiwofifirob.pdf
    • http://maskaevlawyer.ru/userfiles/file/36271605404.pdf
    • http://nanobubblevietnam.com/uploads/userfiles/file/jajuronezerasez.pdf
    • http://sinostandards.net/upload/files/petumerujaxokupamitime.pdf
    • http://prime42.ru/userfiles/files/86022485860.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/10ci0kshr8etmqrcaal83ispq2/38200657058.pdf
    • https://ncvpte.in/userfiles/file/61743513186.pdf
    • http://cesurmakina.com/userfiles/file/ronexofovidazid.pdf
    • https://feldmann-spedition.de/pics/userfiles/file/92810049239.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=spring+junit+tutorial
    • 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_off0000b716.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB716 16792 bytes
font_01_sfnt_off0000cf2d.bin
2c97badfd6be364f53b0430a8102096157b9244d130dc713e7bac3f046cde115		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2D 10432 bytes
font_02_sfnt_off0000e6d8.bin
ebe6a567bd9eb054acd1b87a4a96ac1864e0b57bcd4dba547b5594ad6ee52465		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D8 19584 bytes

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