Malicious PDF — malware analysis report

Static analysis result for SHA-256 95efd1be57a20db2…

MALICIOUS

PDF

77.5 KB Created: 2021-03-18 12:11:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7f9992613ea984c97e0d69de887b9525 SHA-1: 32fd126e834689e17a6223bf897d72a5798045fe SHA-256: 95efd1be57a20db2db48ad0c6ed0ddc3b7d9676f37e798922a84f41c0b41bb07
126 Risk Score

Malware Insights

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

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 0.9998

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://ponafet.ru/strik?utm_term=how+long+will+a+kerosene+heater+wick+last PDF link annotation
    • http://cafe-cok.ru/82642621791aqkr4.pdfIn PDF document text
    • http://gaydating.world/letter_g_worksheets_freelbfbk.pdfIn PDF document text
    • http://hurleyshamburgers.com/champions_league_intro_music17ar0.pdfIn PDF document text
    • https://cdn.sqhk.co/xovatagemi/jehdZU3/police_report_crime_uk.pdfIn PDF document text
    • http://online-sistem.site/39771742239hdu4n.pdfIn PDF document text
    • https://cdn.sqhk.co/givefugonuw/tjfjdjd/84287669481.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/how_to_program_a_programmable_logic_controllerdjpr4.pdfIn PDF document text
    • http://mosiruduv.22web.org/17456614184.pdfIn PDF document text
    • https://cdn.sqhk.co/moturira/jgjggCI/obstacles_syd_matters_life_is_strange.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/njijfig/craft_pocket_3d_apk_mod_gems.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuniruf/9gcpshh/small_business_accounting_software_for_mac_reviews.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tagitefidunun.epizy.com/wovezinukuseverofibosun.pdfIn PDF document text
    • http://miduzusajaveg.rf.gd/dagaterubal.pdfIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_f762cba452a84ff8b5fd774250e78ac4.pdf?index=trueIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_4e226f9a43634c4e92acdb8357eb9798.pdf?index=trueIn PDF document text
    • http://nobibovadov.rf.gd/83700297362.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/spring_mvc_framework.pdfIn PDF document text
    • http://zevuketeno.rf.gd/zurugopesu.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/cisco_webex_meeting_server_upgrade_guide.pdfIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_b484cb0258e8406c95cfb66167e447ec.pdf?index=trueIn 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_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 5176 bytes
SHA-256: 894d742f530e05740319bb8af980cc85d66a9e0abb12b4ce34deefa2622fb97b
font_01_sfnt_off00010271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10271 11120 bytes
SHA-256: 28ff5ee0ed968ed816fb7ddab08ba70f3a54a981a6d250da793772953d25772e

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