Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1e25a7561f7212…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 01:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5c20da43c95b2cecf237cd4f3e9537c0 SHA-1: 0f14132a57b198cc85ca877e27cbbb6c449690b9 SHA-256: df1e25a7561f7212c871c0522cf9e927fcf983e8522f47ffff2d5456722acd6d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous embedded URLs, suggesting an attempt to redirect the user to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a link-farming or phishing attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.farmaciapenil.es/userfiles/files/80683635042.pdf In PDF document text
    • http://dallapietamarchisio.it/userfiles/files/66399566920.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/92443614310.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161308cf47308b---nozijebupekijaf.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/jinikidoxobuwo.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/64987746815.pdfIn PDF document text
    • http://jyczgj.com/UploadFiles/file///2021090819532496.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/13138550496.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/96853540097.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/teposusuvetipagu.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/51800964129.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/62990349344.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-5/20210905203131709253.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/98996098991.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/24357547773.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///90688388626.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/gafalalobazorapogivikul.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613109927c8e0---34824341796.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/dofex.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/bifukuxonovisiju.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///jukurixokegowopod.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/813607957.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/wukuwazagesonobezodusizu.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/75638253011.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/tojemulugib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=steam+coupon+codes+freePDF 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_off0000d7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C2 18764 bytes
SHA-256: 6527fc7a3d177920643e68ee1197ed7eed59d98ff60652320512390d4cf50908
font_01_sfnt_off000108ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C2 10820 bytes
SHA-256: 8bf97cf5b2224294b638bb688d75617dead332b8c72a3288de7b586b8bef6996