Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b621ab22bfe484e…

MALICIOUS

PDF

72.4 KB Created: 2021-03-11 05:04:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ecd6fd41c23644c1e5acb9146f4ce3f3 SHA-1: 9cbb218f1db737e0f056b0f3720fbb4dd08b0a8b SHA-256: 8b621ab22bfe484e04bc3ed268dbf582435408e67886f633708c3fd7fd815bbb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://resalured.ru/wix?keyword=the+three-body+problem+pdf+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459166/normal_5fe7083b5b7c4.pdfIn PDF document text
    • https://meligobuv.weebly.com/uploads/1/3/1/0/131070858/mevigibemapowisevab.pdfIn PDF document text
    • http://bavewemelemare.iblogger.org/dukedutuzojomin.pdfIn PDF document text
    • https://xizexinapak.weebly.com/uploads/1/3/4/3/134359948/labajevavubasifarabu.pdfIn PDF document text
    • https://wusaveverafojiz.weebly.com/uploads/1/3/4/3/134338410/4492338.pdfIn PDF document text
    • https://palujaburufo.weebly.com/uploads/1/3/2/7/132740236/5939512.pdfIn PDF document text
    • https://tunutepefa.weebly.com/uploads/1/3/1/4/131453603/5823427.pdfIn PDF document text
    • http://gesoxusem.iblogger.org/ojt_narrative_report_acknowledgement_sample.pdfIn PDF document text
    • http://sipebep.22web.org/colorado_elk_harvest_report.pdfIn PDF document text
    • https://zedabobosarafon.weebly.com/uploads/1/3/0/8/130813357/warew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415745/normal_6000bfe7703ab.pdfIn PDF document text
    • http://fikepoj.22web.org/benim_hocam_ders_notlar_tyt.pdfIn PDF document text
    • http://zakozoxutujo.22web.org/gelel.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/desenaz/icloud_unlock_tool_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/vomuvudakeme.pdfIn PDF document text
    • https://s3.amazonaws.com/zowibatev/imagenes_de_manualidades_con_reciclaje_de_carton.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/tibosivukitixaxawe.pdfIn PDF document text
    • http://midelex.epizy.com/beacon_school_folkestone_uniform.pdfIn PDF document text
    • http://pavunununege.epizy.com/3655654745.pdfIn PDF document text
    • http://kegipufi.rf.gd/dawewarifanuvijirunito.pdfIn PDF document text
    • http://vukabufe.epizy.com/autel_maxiscan_ms300_can_obdii_scan_tool_instructions.pdfIn PDF document text
    • http://dinedolorexos.rf.gd/dawson_s_creek_episodes_guide.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_off0000e0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F6 5116 bytes
SHA-256: 8f81bbdb3b6c3c4f0778d8104be396695deb5fc5114e02e2403b5ef5e8533884
font_01_sfnt_off0000f237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF237 9912 bytes
SHA-256: 8ced7146b28e67d917c207d71b2bdf79934b08179f202c957ff2f673aa110f0e

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