Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5379e072c60dac…

MALICIOUS

PDF

81.1 KB Created: 2021-02-18 12:20:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dc1f63ae4a9e9de5074a3696e825e4cf SHA-1: 15f067dda93832fd329d2cd8bbefa4ffa49a8258 SHA-256: bf5379e072c60dac4637fda2f1a1d27ee90ea62f9f0f9e4583db13c18d26ed8d
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 0.9997

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://leonvi.ru/strik?utm_term=hp+officejet+pro+8500a+software+free+download PDF link annotation
    • https://xajimago.weebly.com/uploads/1/3/0/8/130813364/80c32dbae.pdfIn PDF document text
    • https://valodoxajub.weebly.com/uploads/1/3/4/4/134435871/bedika_gunuwojatip_kusoweter_lesusow.pdfIn PDF document text
    • https://suterigegopos.weebly.com/uploads/1/3/2/6/132695321/zavuvogovaran-ninuza-sanolano-mapet.pdfIn PDF document text
    • https://furimulu.weebly.com/uploads/1/3/1/4/131411024/4c4b0b2a.pdfIn PDF document text
    • http://gelivebun.22web.org/definition_of_accounting_information_system.pdfIn PDF document text
    • https://tesutubesonazi.weebly.com/uploads/1/3/4/6/134682982/jitekijazaz.pdfIn PDF document text
    • http://jasetukuxazep.22web.org/71124033075.pdfIn PDF document text
    • https://bagopilijesab.weebly.com/uploads/1/3/1/4/131438775/nadusa.pdfIn PDF document text
    • http://nitalesilafatem.22web.org/live_cable_tv_apps_for_android.pdfIn PDF document text
    • https://diwolusetu.weebly.com/uploads/1/3/5/2/135299278/moneta_fapozazuza_vikosi_vupiro.pdfIn PDF document text
    • http://rexirututesopew.iblogger.org/erik_killmonger_theme_song.pdfIn PDF document text
    • https://vozokeku.weebly.com/uploads/1/3/1/8/131857213/fawamivesezivove.pdfIn PDF document text
    • https://buketopol.weebly.com/uploads/1/3/4/0/134013372/4c2db47baec06e7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://giwofigu.epizy.com/bc_speculation_tax_declaration_form.pdfIn PDF document text
    • http://remavolef.epizy.com/komijafatuko.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/video_from_facebook_private_account.pdfIn PDF document text
    • http://ditonumu.epizy.com/calisthenics_workout_no_equipment.pdfIn PDF document text
    • http://votitagupen.epizy.com/crossfit_level_2_programming_template.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/organic_crib_sheets_made_in_usa.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/mathworksheets4kids_writing_inequalities.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE862 5736 bytes
SHA-256: 2c1978bf6352604a3c910ac40370dc464c10baa01bb6c3e7ada5814405c57b3b
font_01_sfnt_off0000fc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC19 10168 bytes
SHA-256: 35370919136b27262dc7fa2f51c362224e9d08602f43f50830a543c6ee593824
font_02_sfnt_off00011f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F31 16144 bytes
SHA-256: aa1464b36b52ac156dd3ea04bc30a94b8376eaa6838293fad627926ea8981a5c

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