Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee870b4b3b32fc9…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 17:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 03b2d68d51081d90ae1b3d91bafdb1ee SHA-1: fd11af01c123eb6d07490f46efd9f3c61a19d627 SHA-256: dee870b4b3b32fc935072cfdb54e9eca8da670f8d7fb9193edb7e74997d4fe55
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614185e563d6d---95123707906.pdf In PDF document text
    • http://upoart.com/ckfinder/userfiles/files/2004240912.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/88483329221.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/denojidipoxirizup.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/parepowirakekepemafado.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/24186080326.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/zarudejokuzon.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/45246849039.pdfIn PDF document text
    • http://csp.hu/editor_up/tewururikalexexobunenijof.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/vagamo.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/98766448748.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/fegevakuzel.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109171955464987.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/10198469126.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/53371175924.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/35773217692.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/nugibiku.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/totaxajuzimukesokunavavuj.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/ronixevofew.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/difapaf.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/9492222457.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/xegutubaxagorinolut.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/14911810590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=can+you+schedule+a+text+androidPDF 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_off0000d187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD187 20080 bytes
SHA-256: c7a379370bbd6f04e3c072f577d2eebf53c0752864bfc3502e6fe5b54444ca07
font_01_sfnt_off000105a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBE 10816 bytes
SHA-256: 879cea8aba6acbe876e1d500fcdacaf817056140d38fc2c90bfe7a9b3c1d2d63