Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cd2ee4eb53d198b…

MALICIOUS

PDF

85.6 KB Created: 2021-03-29 17:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5d29f57df066bb305b217ab6801890bc SHA-1: 535d382cc95abd9bd245a1a748ee1fb5ec3adf9e SHA-256: 2cd2ee4eb53d198ba95658b88433150d456b0f3909864c5fe4d095118008fe33
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/123?utm_term=portable+android+emulator+2017 PDF link annotation
    • http://zujewubowufonug.scienceontheweb.net/jewitazobetaze.pdfIn PDF document text
    • http://lazategomid.scienceontheweb.net/how_to_rewire_a_sprinkler_system.pdfIn PDF document text
    • http://vujejike.iblogger.org/what_is_glacial_acetic_acid.pdfIn PDF document text
    • http://jijuduli.mywebcommunity.org/8826792808.pdfIn PDF document text
    • http://mitimewigupito.mypressonline.com/data_analysis_in_communication_research.pdfIn PDF document text
    • https://cdn.sqhk.co/libewepigux/hjZT9hT/crazy_for_racing_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/bjeSNii/58600465689.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/how_to_record_in_jio_set_top_box.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/facebook_archived_messages_android.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/best_smartwatch_in_philippines.pdfIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_42e5147482564b04a181e45dcac3ca1f.pdf?index=trueIn PDF document text
    • http://rixavadalut.rf.gd/removexal.pdfIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_e26e7c184dc34e499adf9d1d7864c348.pdf?index=trueIn PDF document text
    • https://83f018a0-8e49-44f0-b57e-805e464a5f06.filesusr.com/ugd/10a4aa_98bfb6d51f304864a2212d1e73b82c91.pdf?index=trueIn PDF document text
    • https://b1394492-4877-47b1-8bf2-e962974baa99.filesusr.com/ugd/3e4b7a_bdfb7766f9c242ec8680f70b41baa330.pdf?index=trueIn PDF document text
    • https://7fd4abad-31f8-4c52-ae8e-93d0cc7f2af2.filesusr.com/ugd/910e70_5fdc87abf80141cfaaee331d1ee5e22a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/writing_an_autobiography_worksheet.pdfIn PDF document text
    • http://ruxurosagogaru.epizy.com/41075772472.pdfIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_9df2122257964944a14142608b28d066.pdf?index=trueIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_4130addfea534a37ada1fcda1253b0f5.pdf?index=trueIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_d8ff6ab5f087452d96a37a8cc3f64c67.pdf?index=trueIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_c840972ec3814d5b940949a6733fb46c.pdf?index=trueIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_6549d55a7a694a078e1fe9d970afd37f.pdf?index=trueIn PDF document text
    • http://suxanovovogemi.rf.gd/pulipevabideg.pdfIn PDF document text
    • http://satekivu.rf.gd/free_classical_guitar_sheet_music.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_off000102d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D2 5340 bytes
SHA-256: 2f4b767468377de4871b2242574f93529a2fbceb29b6111ecdf5d3e84ad5390f
font_01_sfnt_off000114e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E8 16076 bytes
SHA-256: 6758ad196a8a3b4814bc93eb88ac9a958f8e53d93b1a82310ed840c17dace571