Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9cfbbfd3e97c6e0…

MALICIOUS

PDF

72.7 KB Created: 2021-02-18 14:02:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b0febb514583f744b51523e386382653 SHA-1: dce61dd4567d0c250953808c78dcca36229d9051 SHA-256: f9cfbbfd3e97c6e02ba3837b76f4bed2d350b8a58e0b18c94dea6336aefae4b8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs pointing to suspicious domains, suggesting it acts as a lure to phishing or malware distribution sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, further supporting its role as a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/aws?utm_term=how+to+turn+boiler+pilot+light+on PDF link annotation
    • http://fbcopyright-center.com/cpr_guidelines_1980wzkn6.pdfIn PDF document text
    • http://pmaider.com/37821773165uxecn.pdfIn PDF document text
    • http://parhelifrl.space/zagebemoburiwikf7rpo.pdfIn PDF document text
    • http://egrn-order.online/scat_anxiety_testpwjbz.pdfIn PDF document text
    • http://naturaleone.space/wenazobulisimufoluxwpog.pdfIn PDF document text
    • http://milesnires.xyz/new_zealand_standard_curriculum_vitae_templatesgiit.pdfIn PDF document text
    • http://bigwin-1xbet.fun/xovokkm685.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372721/normal_5fea449a5f4ba.pdfIn PDF document text
    • http://merulabodonulu.iblogger.org/10759613967.pdfIn PDF document text
    • http://baltika-trans.ru/long_division_worksheets_grade_10wweep.pdfIn PDF document text
    • http://smartbright.club/980987293168s9bo.pdfIn PDF document text
    • http://wowunoli.22web.org/el_libro_de_la_cabala.pdfIn PDF document text
    • http://ipatovaalena.ru/launch_pad_meaning_in_urdup5h6u.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495974/normal_5fe062c9424b7.pdfIn PDF document text
    • http://workshop-fb.ru/berunomviyih.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fanevisexika.epizy.com/37364507789.pdfIn PDF document text
    • http://rusuxipek.rf.gd/dagilulipuk.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_off0000e0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A1 4884 bytes
SHA-256: 2175a57c478875790e0430fea31746624f220c353999ad0c635ac6f314228148
font_01_sfnt_off0000f148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 10632 bytes
SHA-256: b66dfd50ad069ce7c917e6ddfc6fbe6051007f8e48c10e0cbd2fd635838f6b9b

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