Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6fd5c17e86bcc6…

MALICIOUS

PDF

73.0 KB Created: 2021-09-24 06:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0193a7a04c45bdc5317d1b470248d374 SHA-1: 3e1e673ba3e8acdbb5d6ffc9fe546314e8102b6d SHA-256: df6fd5c17e86bcc67f1493e2d4985886eba3195ff4baf15e8878cf565b093784
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://irlanc.ru/uplcv?utm_term=dagger+2+simple+example PDF link annotation
    • https://birotex.rs/images/files/kabivimekisolesadem.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/91571985729.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109230701423374.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210913232739_26natl.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/rezitopopedejidixilirosor.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/joxeni.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/jusojuxubinuwopu.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/fokojozejavabuko.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/sivitudovogusawabedi.pdfIn PDF document text
    • http://220-wm01.netdbhosting.com/file/31370280877.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145bc634320d---woloseposuzesaxonejorub.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf9f5db893---17899066282.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/wajovuduzomitofal.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/74227066840.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/18994207628.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210921042019.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/57091911602.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/mexinukib.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/23230116943.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/38600203083.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/99681708491.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/23621939280.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/53331172443.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/81867279133.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/jegifuxuta.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/pisimupalizuvimigazewewa.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/67336763068.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_off0000bbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBBD 10496 bytes
SHA-256: 9e04a4920c2b775730296ba0272121fcace21a1c2ac28a3c721fa86b6cb4133d
font_01_sfnt_off0000d3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB8 16468 bytes
SHA-256: 90ff96680dc9dd6f7a16718e7570c7f45926521b17693104237ac938ed70a510