Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3392b7a7b08c1c0…

MALICIOUS

PDF

77.8 KB Created: 2021-09-24 05:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1c188f61105805328058db2249716bf6 SHA-1: c1a15cb6bd5f09c636696bf2d3c8021690b4ccc3 SHA-256: c3392b7a7b08c1c02fe7fc3f96db895bb5442ee5a4fb19c5cdaf3deaa24b36d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured to appear as file downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting a malicious intent to distribute further payloads or conduct phishing. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://wastran.ru/uplcv?utm_term=android+calculator+program PDF link annotation
    • http://bradzo-ep.com/uploads/files/10576484198.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/vagefeva.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/99767547878.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/kujovivoxezive.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/farazadokoz.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/dudatagawenidomew.pdfIn PDF document text
    • http://mlead.net/images/e/file/bijokovog.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/sagulofigibigulux.pdfIn PDF document text
    • http://identik.hu/editor_up/64264159582.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/zisamuwiberujikese.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/xoxovedegukomibitub.pdfIn PDF document text
    • http://haai.org/upload/file/12967741741.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/ntt03757t7i38iqvmc2glqdat1/naratevelalotufififi.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/felilivo.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/neropona.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bbfa3205f---6374340382.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/40111288972.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/84773003175.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/41130044047.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/gamefifafebobatuleweniz.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/74020018078.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/85049023700.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/17017914152.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/xuxewikadolefale.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/36725594578.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/76891614930.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_off0000ca65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA65 10640 bytes
SHA-256: c8b0defbb006535b60cc12f42231e32c2825d118c95041010bc23ab5c58398a0
font_01_sfnt_off0000e281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE281 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA93 18252 bytes
SHA-256: 15958beaa7c2345d29aad054e5b48196dd8f59264e900f60fd8b3fb7cad021cb