Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d7482424583e88…

MALICIOUS

PDF

82.1 KB Created: 2021-09-16 03:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 45074556bfe3b04819ac7c33086474c7 SHA-1: ad474bcedb6e7a4bb3ef1373331eab866a0de91f SHA-256: 85d7482424583e8868d769924bc7d92c7aedc3b24ec6af29224a8404247bf68d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://german-ex.com/images/blog/file/dexiwujefinolavowufogix.pdf In PDF document text
    • http://bachtungcompany.com/upload/files/jonafo.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109071959202379.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuvigedixasapuzijojilebiv.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137eba66ad7b---xegajimar.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/bazozatudirure.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/vesukixebuvowu.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/rexupukatewaxe.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361d6ef24d5---92505350294.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/bosogoniv.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/xefatimutijezu.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/zejise.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/wezija.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/jexevude.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/kigajerojadaz.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/50008948588.pdfIn PDF document text
    • http://roleco.pl/data/aktualnosci_imgs/file/rinixe.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/kudasudisa.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210909091333.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/51671479345.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021911536345073.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210907160506.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/59613030278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=send+files+from+phone+to+laptop+via+bluetoothPDF link annotation
    • 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_off0000db39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB39 17476 bytes
SHA-256: e3ee1bb285c2f84fab89e37395917597a7a477b7e0eaed11b0c16a86f74ba987
font_01_sfnt_off0001086d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12084 11144 bytes
SHA-256: 6a66dea69d27103ae79bf29ca85b0c2213ef808e8f0c16c37c69d27b3a21fe54