Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59bcaec96b587f2…

MALICIOUS

PDF

121.3 KB Created: 2021-09-13 06:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f095300f470c3b4a2755a1f6c8caf604 SHA-1: f28b0543834366b5b0c5ecec969e5c3d3ec91815 SHA-256: e59bcaec96b587f2826e93c99cdcae028edf01fe0b72bf46310db872d70a0455
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of embedded URLs, many of which point to suspicious domains or are structured in a way that suggests a link farm. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

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://eagle-aviation.com/userfiles/files/vinig.pdf In PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/38627238956.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/14796623296.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/filunujofegafoso.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/bogukirim.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/29697701686.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/46523240488.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/39010172621.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/46655000351.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b31438450e---6500428520.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3afba306afec405355d6c997d42e3c12/babugejajozopirakuluru.pdfIn PDF document text
    • https://telorgabus.com/contents/files/97913425322.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/19662132712.pdfIn PDF document text
    • https://magatek.com/documents/file/56312827565.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/84946616842.pdfIn PDF document text
    • http://wenxuezj.com/images/File/29899442785.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/wekemetijelijulebuwatubo.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210911134902.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109041732504238.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/51384983413.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/javupotuzorafeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=free+1000+diamond+mlPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16370 16516 bytes
SHA-256: 931c8288e9f690dfd6651add956289340041c292fd3dcee4ba67bd5ad9cd6e85
font_02_sfnt_off00017a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A8A 10296 bytes
SHA-256: df27053be78699891e1eb419b9a81bc38848ab6e655f1ceba54cad4bef871341
font_03_sfnt_off00019198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19198 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_04_sfnt_off00019990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19990 23236 bytes
SHA-256: 93966c4c9286b786c6e4dfc3b556747273179f76d9c87fb9b2ee54f37975c962