Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7bc3a8735c1c8b…

MALICIOUS

PDF

85.8 KB Created: 2021-09-16 20:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: bea0d6896e5bda678d6b8c99cdd7a3b8 SHA-1: 1402aa0290d29f9527af8e6315cc3bef608fd665 SHA-256: bb7bc3a8735c1c8b49a61434113daab92a01b70ee0fb62489ff9fe95e694bf40
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to potentially malicious PDF files hosted on various domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://kisikana.hr/UserFiles/files/34969610187.pdf In PDF document text
    • http://gardens-spa.com/user_pict/file/1632232993.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/161424efd3b277---10688243858.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/4nsgeaei0prsk3av67t81q3rc2/55542989928.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/71414822868.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/60271955158.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/xujan.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/96782569176.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/zifetosefojirewimu.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/jewesomif.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/wepenudigawemaf.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///3324857924.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/9213701104.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/zujelogamex.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/64534830153.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71586134151.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/36286377198.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/24248231301.pdfIn PDF document text
    • https://atlantidegattico.it/file/wigajebiginarew.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/vasuzibir.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/retinipexixunifivizo.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/vajekadepuxufub.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/45297972648.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/39391674013.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/tegekiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=android+share+marketPDF 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_off0000eb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10385 10540 bytes
SHA-256: 8160906560e7cd973e2029fed89ffeddd0534f70f3c15d892d36143044995095
font_02_sfnt_off00011b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5E 17928 bytes
SHA-256: dd817463b605347f887f643a993c101db0eb2329d4818657e52f0645db408032