Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1eca6a2c30d488b…

MALICIOUS

PDF

69.2 KB Created: 2021-02-08 23:27:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b0ccf313d7f18f8ac498233aec44fef3 SHA-1: eacf7886ade091803ac60c7408ea98623ba2c742 SHA-256: f1eca6a2c30d488b64f4572f552b9656abe8167117f26b96a01b14f0d390bf11
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded links that redirect to known malicious infrastructure, suggesting it is used as a lure for phishing or to distribute further malware. The presence of multiple links on disposable hosting further supports this assessment.

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
  • 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://yafferge.ru/aws?utm_term=balupu+movie+audio+songs++naa+songs In PDF document text
    • https://cdn.sqhk.co/disumuneriva/PhZienQ/gumixusuperozimorujuguxup.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/ibPDjgE/chocolate_candy_bars_maker_chewing_gum_gamestop.pdfIn PDF document text
    • http://fanuvowebutil.22web.org/nutogafexapudare.pdfIn PDF document text
    • http://sanadewa.iblogger.org/40309746472.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470211/normal_6017400d1f547.pdfIn PDF document text
    • http://munupesifak.22web.org/national_contraception_policy_guidelines_south_africa.pdfIn PDF document text
    • https://lebabipiw.weebly.com/uploads/1/3/0/9/130968925/dca31da.pdfIn PDF document text
    • https://ralerafuzirepob.weebly.com/uploads/1/3/4/3/134386916/6338544.pdfIn PDF document text
    • http://dixajadabaw.66ghz.com/revamatudufuku.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/ihc6igk/lastpass_password_manager_app_store.pdfIn PDF document text
    • http://xavelodezazil.iblogger.org/godrej_industries_annual_report_2015-_16.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bajipelorisu.rf.gd/irregular_verbs_quiz_with_answers.pdfIn PDF document text
    • http://juvudujaxajiji.epizy.com/reasons_for_appraising_team_performance.pdfIn PDF document text
    • http://dejanubotikepiw.rf.gd/auxinas_en_lentejas.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_off0000cefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFA 5292 bytes
SHA-256: 23098369815a2b7d111e25d4518ddbd1494d22da68e1056486180e3ddb1ed311
font_01_sfnt_off0000e0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F8 11072 bytes
SHA-256: 422d3e9b95a851f200cccc703e537cce795e03e1847e6c0f4e092fd411e80305

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