Malicious PDF — malware analysis report

Static analysis result for SHA-256 c346251e0ecaac13…

MALICIOUS

PDF

79.6 KB Created: 2021-09-16 00:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 74c6750a6a23c380397b6b625b05cb7d SHA-1: 67609dfef313e64c514ef760e176e2123372df16 SHA-256: c346251e0ecaac13bc12c75c6f9fbb6a2efd8c9a148408cd50ff1a81642a4dcb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs pointing to potentially malicious or disposable domains. While no scripts were directly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://seksdagen.nl/userfiles/file/sebigozala.pdf In PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/30965579124.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/99392016117.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/radusit.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/dejetudasukofe.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16141096598cb8---nowemevejozo.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/25803685626.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/70526281962.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/74011645796.pdfIn PDF document text
    • http://ustunongel.com/image/files/76953796734.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/zosikufidelizuweno.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/41721564654.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210908_EEDD95F4051F1711.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109102101368961.pdfIn PDF document text
    • https://remini.hu/userfiles/file/77021697521.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/xorivi.pdfIn PDF document text
    • http://orenprom.com/img/account/file/gogoxaxojizubefofareserom.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/26360898381.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/fotasov.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/41554593862.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/9f702c9d4244f987db92f78f625f3e76/58921220411.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/16646720962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=android+not+saving+photosPDF 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_off0000d0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CB 18480 bytes
SHA-256: c11415b051310ce84c29fda5abcd00f94b986ce6ce9bf0d73848358789f1b2e0
font_02_sfnt_off00011995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11995 10540 bytes
SHA-256: 568308ad387fd7bf781941ada0152af22306b6b34ec63f42e245212102e511c4