Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ee0a8439f5fef6…

MALICIOUS

PDF

69.3 KB Created: 2021-04-16 08:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c2d12b1b1367d3091e82249b9ba57a3f SHA-1: 264edd55d2ec92fbe5a8be22a77d154cc7327dbe SHA-256: f8ee0a8439f5fef6200f559594d0f0334d3596d8789fd6859ba527a36af6d724
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious. The document body appears to be obfuscated or corrupted, but the presence of numerous links on disposable hosting suggests a link farm designed to lure users to malicious sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=cinderella+children%2527s+book+author In PDF document text
    • http://bisapusid.mypressonline.com/lefatizipafematawipebu.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/jKigzhj/33871172087.pdfIn PDF document text
    • http://solimabifiper.iblogger.org/what_fast_foods_have_gluten_free.pdfIn PDF document text
    • http://daxosivonoz.iblogger.org/data_structures_interview_questions.pdfIn PDF document text
    • http://sogejovep.mypressonline.com/braiding_machine_design.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/dcbQXgh/35219229587.pdfIn PDF document text
    • https://cdn.sqhk.co/jejekije/FfsOwjd/aliexpress_usa_dresses.pdfIn PDF document text
    • http://fovagenifozemub.iblogger.org/pomojakitubovinopa.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/kikabobekiwod.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/fotojipifuzitul/jatozodudakegiziba.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/2010_camaro_ss_insurance_cost.pdfIn PDF document text
    • http://wijudog.epizy.com/62013569380.pdfIn PDF document text
    • http://jezevenakos.myartsonline.com/how_to_develop_android_app_for_beginners.pdfIn PDF document text
    • https://f2fffe36-c7b4-4b88-9608-518dc6c14750.filesusr.com/ugd/950b2a_0176ef1b63d9432694e677b8a987cfad.pdf?index=trueIn PDF document text
    • http://rivoteb.rf.gd/zomujekasidovidegine.pdfIn PDF document text
    • http://nogogesusuwebob.epizy.com/zasipuwaxewavafugad.pdfIn PDF document text
    • http://rasuvum.rf.gd/how_to_download_gta_5_roleplay_on_xbox_one.pdfIn PDF document text
    • https://7ed1f289-57d1-4e2a-9ee4-b64e0eb498cf.filesusr.com/ugd/13dc0c_fb23cb336878438b88481203a3ddd371.pdf?index=trueIn PDF document text
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_ca9516afb24e4aa08ba7f8a16800f70d.pdf?index=trueIn PDF document text
    • http://wexugemo.epizy.com/vinonokizufidasalitikoxir.pdfIn PDF document text
    • http://fomariwidodazum.rf.gd/como_baixar_editor.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_off0000d017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD017 5168 bytes
SHA-256: eca44add929c54784d3241a95c6fafd55570eb3a1c7adac8afb6f0a4cffa2d16
font_01_sfnt_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 11172 bytes
SHA-256: 1d5ba1bb96782fc640ad6763135723223a8a6299fd7056e3ce2c1536ffcd8c64

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