Malicious PDF — malware analysis report

Static analysis result for SHA-256 9026e39fba115f75…

MALICIOUS

PDF

74.8 KB Created: 2021-04-02 14:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 136491a323a3e4ae77c466b12b3d5a7e SHA-1: e2cced24db8f28df11fc318457837c2954b86b92 SHA-256: 9026e39fba115f757bab64f21368388de2fa807ca877e8f8e99d3433e18313b3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It functions as a link farm, containing numerous external URLs, with at least one identified as a potential redirector. The presence of these links suggests the file is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/123?utm_term=slip+ring+induction+motor+working+principle+pdf PDF link annotation
    • http://koxelovanalimu.getenjoyment.net/ximodufuwexenelogiramis.pdfIn PDF document text
    • http://shothard.site/fetal_growth_and_developmenthro56.pdfIn PDF document text
    • http://tuderoba.getenjoyment.net/base64_encoded_in_html.pdfIn PDF document text
    • http://zukesijinizik.mywebcommunity.org/schaum_s_3000_solved_problems_in_calculus_download.pdfIn PDF document text
    • http://ryursew.space/guwodedaweb9tovb.pdfIn PDF document text
    • http://noksipals.online/technical_writing_tips6s269.pdfIn PDF document text
    • http://scotiaenlineape-personas.com/types_of_curriculumaa7sh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_b7eb37bdbefa4f0593008ea9932966aa.pdf?index=trueIn PDF document text
    • http://zizidamikedug.epizy.com/98138018484.pdfIn PDF document text
    • http://xilidufagipap.rf.gd/how_to_reset_a_rainsoft_water_softener.pdfIn PDF document text
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_b7bd5539f9184750bb4f734b39433156.pdf?index=trueIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_3325414c71e942dd81dda124b4350a66.pdf?index=trueIn PDF document text
    • http://vupaguriwedizid.atwebpages.com/introduction_to_international_criminal_law.pdfIn PDF document text
    • http://pizodixevefok.rf.gd/61489996944.pdfIn PDF document text
    • https://1527c8d3-3321-4e9f-872f-e2bebb57bac2.filesusr.com/ugd/bf2d42_1186d46231444fe3a9d37c18baddaf06.pdf?index=trueIn PDF document text
    • https://71fc3d66-43b2-4ae0-adc3-dfbcdf8b5360.filesusr.com/ugd/6605a0_80364d00cc834a41b6ba7f8ee3985221.pdf?index=trueIn PDF document text
    • https://c4fca8c4-0f54-45c3-ae88-320069d86c16.filesusr.com/ugd/ac0d21_ce329b84b4b14c20963a8cfeeb5ebf72.pdf?index=trueIn PDF document text
    • http://jibovofafef.epizy.com/sesawiwodenu.pdfIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_bfe823c94c5e476cb9e70f9971279a19.pdf?index=trueIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_68d1a96536804a8fa1190049fb520dfe.pdf?index=trueIn PDF document text
    • http://muzokusadozejog.epizy.com/rajanigelopa.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/lowogebiwepunimujibiku.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE726 5348 bytes
SHA-256: 80f3ece33d55f0f789295f0fbd87bf6a5e9113a80ef0af7d8cd8a8ca4eef4044
font_01_sfnt_off0000f95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95F 10456 bytes
SHA-256: a908dfb7520359cf9d519cec71ebc33fac33a8ccc1bd8317c3f834af1b020b4a