Malicious PDF — malware analysis report

Static analysis result for SHA-256 220556c8b29e1973…

MALICIOUS

PDF

73.3 KB Created: 2021-03-05 15:05:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: ff811059be420cb84ebdab723523c37a SHA-1: 93261338db5eef17b5b7b37a2f1c1d86eb23c229 SHA-256: 220556c8b29e197398c7fd30385f2fe4df092bc9d58e30273c345689b1974713
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 phishing or trojan-like behavior. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. One prominent URL, 'https://golowaki.ru/wix?keyword=uc+browser+apk+free+download+old+version', indicates a lure for downloading software. No scripts were extracted, but the PDF structure and numerous URLs point towards a phishing or potentially unwanted software distribution scheme.

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://golowaki.ru/wix?keyword=uc+browser+apk+free+download+old+version PDF link annotation
    • http://xelasurugopu.mywebcommunity.org/37299321211.pdfIn PDF document text
    • http://risiwivozival.iblogger.org/burnside_theorem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476569/normal_5fce95b8f1bff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447101/normal_5fd739314fe96.pdfIn PDF document text
    • http://zeputixov.22web.org/guidelines_for_wildlife_disease_risk_analysis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403413/normal_5fe50183907b1.pdfIn PDF document text
    • http://jozipuvuwuzaj.mywebcommunity.org/onan_4000_rv_generator_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404727/normal_6026bf597f623.pdfIn PDF document text
    • http://ligumexijigab.getenjoyment.net/my_side_of_the_mountain_free_online_movie.pdfIn PDF document text
    • http://noxaduva.mypressonline.com/86978740211.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/27437883923.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_7b69c9a9101948529c9af9654a22e008.pdf?index=trueIn PDF document text
    • http://mepogevotu.epizy.com/bulaia_surf_report.pdfIn PDF document text
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_7bb7f84e1ee64894b8040c207c11ab39.pdf?index=trueIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_d5d5ee6167874f3e8ac73b3254cc4358.pdf?index=trueIn PDF document text
    • http://legatuwaw.epizy.com/descargar_antivirus_avast_gratis_para_android.pdfIn PDF document text
    • https://1f49b3f1-4b09-4f89-88df-03804352fc9a.filesusr.com/ugd/a51aec_84b7b842720f40d696a3e8f770b6931b.pdf?index=trueIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_cc3c8355c1e14f36aa15a6b99cf03e29.pdf?index=trueIn PDF document text
    • https://f6ea5e03-7e7c-4dce-82ee-fd5d223759ef.filesusr.com/ugd/d203ad_7d897acda444491daa9eb5db5ff87326.pdf?index=trueIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_64b4e352259c4da7b27766fd64e7b1dc.pdf?index=trueIn PDF document text
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_9f157e5fbc3c4ad0a8bea7ede7eb6116.pdf?index=trueIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_63046df895b144d28d4ac8c7172659cc.pdf?index=trueIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_2e27352eeea9477b95a3afbbfdf5a2a9.pdf?index=trueIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_68d45f58a2384b35b92ba0e62d06a037.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_off0000e059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE059 5496 bytes
SHA-256: 42fbb5aa8530746304d15863489e52a250ba02b2d0b9ac0b86c1e001888f4888
font_01_sfnt_off0000f336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 10456 bytes
SHA-256: 9f210834eddf33850ee1e2b15be82ad41310fef4b8f39d0295c8f651be97df7c

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